ComboBox Class

Definition

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Source:

ComboBox.cs

Represents a Windows combo box control.

public ref class ComboBox : System::Windows::Forms::ListControl

[System.ComponentModel.DefaultBindingProperty("Text")]
public class ComboBox : System.Windows.Forms.ListControl

[<System.ComponentModel.DefaultBindingProperty("Text")>]
type ComboBox = class
    inherit ListControl

Public Class ComboBox
Inherits ListControl

Inheritance

Object

MarshalByRefObject

Component

Control

ListControl

ComboBox

Derived

Microsoft.VisualBasic.Compatibility.VB6.DriveListBox

System.Windows.Forms.DataGridViewComboBoxEditingControl

Attributes

DefaultBindingPropertyAttribute

Examples

The following code example is a complete application showing how you can use the Add method to add items to a ComboBox, the FindString method to find items in a ComboBox, and the BeginUpdate and EndUpdate methods to efficiently add a large number items to a ComboBox. The ability to store values that are different from displayed text is inherited from ListControl. For an example of how to use this feature, see the ListControl class.

You must add references to the System.Drawing and System.Windows.Forms namespaces to run this example.

#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Windows::Forms;

namespace Win32Form1Namespace
{
   public ref class Win32Form1: public System::Windows::Forms::Form
   {
   private:
      System::Windows::Forms::Button^ addButton;
      System::Windows::Forms::TextBox^ textBox2;
      System::Windows::Forms::Button^ addGrandButton;
      System::Windows::Forms::ComboBox^ comboBox1;
      System::Windows::Forms::Button^ showSelectedButton;
      System::Windows::Forms::TextBox^ textBox1;
      System::Windows::Forms::Button^ findButton;
      System::Windows::Forms::Label ^ label1;

   public:
      Win32Form1()
      {
         this->InitializeComponent();
      }

   private:
      void InitializeComponent()
      {
         this->addButton = gcnew System::Windows::Forms::Button;
         this->textBox2 = gcnew System::Windows::Forms::TextBox;
         this->addGrandButton = gcnew System::Windows::Forms::Button;
         this->comboBox1 = gcnew System::Windows::Forms::ComboBox;
         this->showSelectedButton = gcnew System::Windows::Forms::Button;
         this->textBox1 = gcnew System::Windows::Forms::TextBox;
         this->findButton = gcnew System::Windows::Forms::Button;
         this->label1 = gcnew System::Windows::Forms::Label;
         this->addButton->Location = System::Drawing::Point( 248, 32 );
         this->addButton->Size = System::Drawing::Size( 40, 24 );
         this->addButton->TabIndex = 1;
         this->addButton->Text = "Add";
         this->addButton->Click += gcnew System::EventHandler(
            this, &Win32Form1::addButton_Click );
         this->textBox2->Location = System::Drawing::Point( 8, 64 );
         this->textBox2->Size = System::Drawing::Size( 232, 20 );
         this->textBox2->TabIndex = 6;
         this->textBox2->Text = "";
         this->addGrandButton->Location = System::Drawing::Point( 8, 96 );
         this->addGrandButton->Size = System::Drawing::Size( 280, 23 );
         this->addGrandButton->TabIndex = 2;
         this->addGrandButton->Text = "Add 1, 000 Items";
         this->addGrandButton->Click += gcnew System::EventHandler(
            this, &Win32Form1::addGrandButton_Click );
         this->comboBox1->Anchor = (System::Windows::Forms::AnchorStyles)(
            (System::Windows::Forms::AnchorStyles::Bottom | System::Windows::Forms::AnchorStyles::Left) |
             System::Windows::Forms::AnchorStyles::Right);
         this->comboBox1->DropDownWidth = 280;
         array<Object^>^ objectArray = {"Item 1",
            "Item 2",
            "Item 3",
            "Item 4",
            "Item 5"};
         this->comboBox1->Items->AddRange( objectArray );
         this->comboBox1->Location = System::Drawing::Point( 8, 248 );
         this->comboBox1->Size = System::Drawing::Size( 280, 21 );
         this->comboBox1->TabIndex = 7;
         this->showSelectedButton->Location = System::Drawing::Point( 8, 128 );
         this->showSelectedButton->Size = System::Drawing::Size( 280, 24 );
         this->showSelectedButton->TabIndex = 4;
         this->showSelectedButton->Text = "What Item is Selected?";
         this->showSelectedButton->Click += gcnew System::EventHandler( 
            this, &Win32Form1::showSelectedButton_Click );
         this->textBox1->Location = System::Drawing::Point( 8, 32 );
         this->textBox1->Size = System::Drawing::Size( 232, 20 );
         this->textBox1->TabIndex = 5;
         this->textBox1->Text = "";
         this->findButton->Location = System::Drawing::Point( 248, 64 );
         this->findButton->Size = System::Drawing::Size( 40, 24 );
         this->findButton->TabIndex = 3;
         this->findButton->Text = "Find";
         this->findButton->Click += gcnew System::EventHandler( 
            this, &Win32Form1::findButton_Click );
         this->label1->Location = System::Drawing::Point( 8, 224 );
         this->label1->Size = System::Drawing::Size( 144, 23 );
         this->label1->TabIndex = 0;
         this->label1->Text = "Test ComboBox";
         this->ClientSize = System::Drawing::Size( 292, 273 );
         array<System::Windows::Forms::Control^>^ controlsArray = {this->comboBox1,
            this->textBox2,
            this->textBox1,
            this->showSelectedButton,
            this->findButton,
            this->addGrandButton,
            this->addButton,
            this->label1};
         this->Controls->AddRange( controlsArray );
         this->Text = "ComboBox Sample";
      }

      void addButton_Click( Object^ sender, System::EventArgs^ e )
      {
         comboBox1->Items->Add( textBox1->Text );
      }

      void addGrandButton_Click( Object^ sender, System::EventArgs^ e )
      {
         comboBox1->BeginUpdate();
         for ( int i = 0; i < 1000; i++ )
         {
            comboBox1->Items->Add( "Item 1 " + i.ToString() );

         }
         comboBox1->EndUpdate();
      }

      void findButton_Click( Object^ sender, System::EventArgs^ e )
      {
         int index = comboBox1->FindString( textBox2->Text );
         comboBox1->SelectedIndex = index;
      }

      void showSelectedButton_Click( Object^ sender, System::EventArgs^ e )
      {
         int selectedIndex = comboBox1->SelectedIndex;
         Object^ selectedItem = comboBox1->SelectedItem;
         MessageBox::Show( "Selected Item Text: " + selectedItem->ToString() + "\n" +
            "Index: " + selectedIndex.ToString() );
      }
   };
}


[System::STAThreadAttribute]
int main()
{
   System::Windows::Forms::Application::Run( gcnew Win32Form1Namespace::Win32Form1 );
}

using System;
using System.Windows.Forms;

namespace Win32Form1Namespace {

    public class Win32Form1 : System.Windows.Forms.Form {
        private System.Windows.Forms.Button addButton;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.Button addGrandButton;
        private System.Windows.Forms.ComboBox comboBox1;
        private System.Windows.Forms.Button showSelectedButton;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Button findButton;
        private System.Windows.Forms.Label label1;
        
        public Win32Form1() {
            this.InitializeComponent();
        }
        
        [System.STAThreadAttribute()]
        public static void Main() {
            System.Windows.Forms.Application.Run(new Win32Form1());
        }
        
        private void InitializeComponent() {
            this.addButton = new System.Windows.Forms.Button();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.addGrandButton = new System.Windows.Forms.Button();
            this.comboBox1 = new System.Windows.Forms.ComboBox();
            this.showSelectedButton = new System.Windows.Forms.Button();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.findButton = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.addButton.Location = new System.Drawing.Point(248, 32);
            this.addButton.Size = new System.Drawing.Size(40, 24);
            this.addButton.TabIndex = 1;
            this.addButton.Text = "Add";
            this.addButton.Click += new System.EventHandler(this.addButton_Click);
            this.textBox2.Location = new System.Drawing.Point(8, 64);
            this.textBox2.Size = new System.Drawing.Size(232, 20);
            this.textBox2.TabIndex = 6;
            this.textBox2.Text = "";
            this.addGrandButton.Location = new System.Drawing.Point(8, 96);
            this.addGrandButton.Size = new System.Drawing.Size(280, 23);
            this.addGrandButton.TabIndex = 2;
            this.addGrandButton.Text = "Add 1,000 Items";
            this.addGrandButton.Click += new System.EventHandler(this.addGrandButton_Click);
            this.comboBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left) 
                        | System.Windows.Forms.AnchorStyles.Right);
            this.comboBox1.DropDownWidth = 280;
            this.comboBox1.Items.AddRange(new object[] {"Item 1",
                        "Item 2",
                        "Item 3",
                        "Item 4",
                        "Item 5"});
            this.comboBox1.Location = new System.Drawing.Point(8, 248);
            this.comboBox1.Size = new System.Drawing.Size(280, 21);
            this.comboBox1.TabIndex = 7;
            this.showSelectedButton.Location = new System.Drawing.Point(8, 128);
            this.showSelectedButton.Size = new System.Drawing.Size(280, 24);
            this.showSelectedButton.TabIndex = 4;
            this.showSelectedButton.Text = "What Item is Selected?";
            this.showSelectedButton.Click += new System.EventHandler(this.showSelectedButton_Click);
            this.textBox1.Location = new System.Drawing.Point(8, 32);
            this.textBox1.Size = new System.Drawing.Size(232, 20);
            this.textBox1.TabIndex = 5;
            this.textBox1.Text = "";
            this.findButton.Location = new System.Drawing.Point(248, 64);
            this.findButton.Size = new System.Drawing.Size(40, 24);
            this.findButton.TabIndex = 3;
            this.findButton.Text = "Find";
            this.findButton.Click += new System.EventHandler(this.findButton_Click);
            this.label1.Location = new System.Drawing.Point(8, 224);
            this.label1.Size = new System.Drawing.Size(144, 23);
            this.label1.TabIndex = 0;
            this.label1.Text = "Test ComboBox";
            this.ClientSize = new System.Drawing.Size(292, 273);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {this.comboBox1,
                        this.textBox2,
                        this.textBox1,
                        this.showSelectedButton,
                        this.findButton,
                        this.addGrandButton,
                        this.addButton,
                        this.label1});
            this.Text = "ComboBox Sample";
        }
        
        private void addButton_Click(object sender, System.EventArgs e) {
           comboBox1.Items.Add(textBox1.Text);
        }

        private void addGrandButton_Click(object sender, System.EventArgs e) {
            comboBox1.BeginUpdate();
            for (int i = 0; i < 1000; i++) {
                comboBox1.Items.Add("Item 1" + i.ToString());
            }
            comboBox1.EndUpdate();
        }

        private void findButton_Click(object sender, System.EventArgs e) {
            int index = comboBox1.FindString(textBox2.Text);
            comboBox1.SelectedIndex = index;
        }

        private void showSelectedButton_Click(object sender, System.EventArgs e) {
            int selectedIndex = comboBox1.SelectedIndex;
            Object selectedItem = comboBox1.SelectedItem;

            MessageBox.Show("Selected Item Text: " + selectedItem.ToString() + "\n" +
                            "Index: " + selectedIndex.ToString());
        }
    }
}

Imports System.Windows.Forms

Namespace ComboBoxSampleNamespace

    Public Class ComboBoxSample
        Inherits System.Windows.Forms.Form

        Private addButton As System.Windows.Forms.Button
        Private textBox2 As System.Windows.Forms.TextBox
        Private addGrandButton As System.Windows.Forms.Button
        Private comboBox1 As System.Windows.Forms.ComboBox
        Private showSelectedButton As System.Windows.Forms.Button
        Private textBox1 As System.Windows.Forms.TextBox
        Private findButton As System.Windows.Forms.Button
        Private label1 As System.Windows.Forms.Label

        Public Sub New()
            MyBase.New()
            Me.InitializeComponent()
        End Sub

        <System.STAThreadAttribute()> Public Shared Sub Main()
            System.Windows.Forms.Application.Run(New ComboBoxSample())
        End Sub

        Private Sub InitializeComponent()
            Me.addButton = New System.Windows.Forms.Button()
            Me.textBox2 = New System.Windows.Forms.TextBox()
            Me.addGrandButton = New System.Windows.Forms.Button()
            Me.comboBox1 = New System.Windows.Forms.ComboBox()
            Me.showSelectedButton = New System.Windows.Forms.Button()
            Me.textBox1 = New System.Windows.Forms.TextBox()
            Me.findButton = New System.Windows.Forms.Button()
            Me.label1 = New System.Windows.Forms.Label()
            Me.addButton.Location = New System.Drawing.Point(248, 32)
            Me.addButton.Size = New System.Drawing.Size(40, 24)
            Me.addButton.TabIndex = 1
            Me.addButton.Text = "Add"
            AddHandler Me.addButton.Click, AddressOf Me.addButton_Click
            Me.textBox2.Location = New System.Drawing.Point(8, 64)
            Me.textBox2.Size = New System.Drawing.Size(232, 20)
            Me.textBox2.TabIndex = 6
            Me.textBox2.Text = ""
            Me.addGrandButton.Location = New System.Drawing.Point(8, 96)
            Me.addGrandButton.Size = New System.Drawing.Size(280, 23)
            Me.addGrandButton.TabIndex = 2
            Me.addGrandButton.Text = "Add 1,000 Items"
            AddHandler Me.addGrandButton.Click, AddressOf Me.addGrandButton_Click
            Me.comboBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left) _
                        Or System.Windows.Forms.AnchorStyles.Right)
            Me.comboBox1.DropDownWidth = 280
            Me.comboBox1.Items.AddRange(New Object() {"Item 1", "Item 2", "Item 3", "Item 4", "Item 5"})
            Me.comboBox1.Location = New System.Drawing.Point(8, 248)
            Me.comboBox1.Size = New System.Drawing.Size(280, 21)
            Me.comboBox1.TabIndex = 7
            Me.showSelectedButton.Location = New System.Drawing.Point(8, 128)
            Me.showSelectedButton.Size = New System.Drawing.Size(280, 24)
            Me.showSelectedButton.TabIndex = 4
            Me.showSelectedButton.Text = "What Item is Selected?"
            AddHandler Me.showSelectedButton.Click, AddressOf Me.showSelectedButton_Click
            Me.textBox1.Location = New System.Drawing.Point(8, 32)
            Me.textBox1.Size = New System.Drawing.Size(232, 20)
            Me.textBox1.TabIndex = 5
            Me.textBox1.Text = ""
            Me.findButton.Location = New System.Drawing.Point(248, 64)
            Me.findButton.Size = New System.Drawing.Size(40, 24)
            Me.findButton.TabIndex = 3
            Me.findButton.Text = "Find"
            AddHandler Me.findButton.Click, AddressOf Me.findButton_Click
            Me.label1.Location = New System.Drawing.Point(8, 224)
            Me.label1.Size = New System.Drawing.Size(144, 23)
            Me.label1.TabIndex = 0
            Me.label1.Text = "Test ComboBox"
            Me.ClientSize = New System.Drawing.Size(292, 273)
            Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.comboBox1, Me.textBox2, Me.textBox1, Me.showSelectedButton, Me.findButton, Me.addGrandButton, Me.addButton, Me.label1})
            Me.Text = "ComboBox Sample"
        End Sub

        Private Sub addButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
            comboBox1.Items.Add(textBox1.Text)
        End Sub

        Private Sub findButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
            Dim index As Integer
            index = comboBox1.FindString(textBox2.Text)
            comboBox1.SelectedIndex = index
        End Sub

        Private Sub addGrandButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
            comboBox1.BeginUpdate()
            Dim I As Integer
            For I = 0 To 1000
                comboBox1.Items.Add("Item 1" + i.ToString())
            Next
            comboBox1.EndUpdate()
        End Sub

        Private Sub showSelectedButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
            Dim selectedIndex As Integer
            selectedIndex = comboBox1.SelectedIndex
            Dim selectedItem As Object
            selectedItem = comboBox1.SelectedItem

            MessageBox.Show("Selected Item Text: " & selectedItem.ToString() & Microsoft.VisualBasic.Constants.vbCrLf & _
                                "Index: " & selectedIndex.ToString())
        End Sub
    End Class
End Namespace

Remarks

A ComboBox displays a text box combined with a ListBox, which enables the user to select items from the list or enter a new value.

The DropDownStyle property specifies whether the list is always displayed or whether the list is displayed in a drop-down. The DropDownStyle property also specifies whether the text portion can be edited. See ComboBoxStyle for the available settings and their effects. There is no setting to always display the list and disallow entering a new value. To display a list to which no new values can be added, use a ListBox control.

To add or remove objects in the list at run time, use methods of the ComboBox.ObjectCollection class (through the Items property of the ComboBox). You can assign an array of object references with the AddRange method. The list then displays the default string value for each object. You can add individual objects with the Add method. You can delete items with the Remove method or clear the entire list with the Clear method.

In addition to display and selection functionality, the ComboBox also provides features that enable you to efficiently add items to the ComboBox and to find text within the items of the list. With the BeginUpdate and EndUpdate methods, you can add a large number of items to the ComboBox without the control being repainted each time an item is added to the list. The FindString and FindStringExact methods enable you to search for an item in the list that contains a specific search string.

You can use these properties to manage the currently selected item in the list, the Text property to specify the string displayed in the editing field, the SelectedIndex property to get or set the current item, and the SelectedItem property to get or set a reference to the object.

Note

If you have a ListBox, ComboBox, or CheckedListBox on a base Windows Forms page and want to modify the string collections of those controls in a derived form, the string collections of those controls in the base form must be empty. If the string collections are not empty, they become read-only when you derive another form.

Constructors

ComboBox()

Initializes a new instance of the ComboBox class.

Properties

AccessibilityObject	Gets the AccessibleObject assigned to the control. (Inherited from Control)
AccessibleDefaultActionDescription	Gets or sets the default action description of the control for use by accessibility client applications. (Inherited from Control)
AccessibleDescription	Gets or sets the description of the control used by accessibility client applications. (Inherited from Control)
AccessibleName	Gets or sets the name of the control used by accessibility client applications. (Inherited from Control)
AccessibleRole	Gets or sets the accessible role of the control. (Inherited from Control)
AllowDrop	Gets or sets a value indicating whether the control can accept data that the user drags onto it. (Inherited from Control)
AllowSelection	Gets a value indicating whether the list enables selection of list items. (Inherited from ListControl)
Anchor	Gets or sets the edges of the container to which a control is bound and determines how a control is resized with its parent. (Inherited from Control)
AutoCompleteCustomSource	Gets or sets a custom StringCollection to use when the AutoCompleteSource property is set to CustomSource.
AutoCompleteMode	Gets or sets an option that controls how automatic completion works for the ComboBox.
AutoCompleteSource	Gets or sets a value specifying the source of complete strings used for automatic completion.
AutoScrollOffset	Gets or sets where this control is scrolled to in ScrollControlIntoView(Control). (Inherited from Control)
AutoSize	This property is not relevant for this class. (Inherited from Control)
BackColor	Gets or sets the background color for the control.
BackgroundImage	This property is not relevant to this class.
BackgroundImageLayout	Gets or sets the background image layout as defined in the ImageLayout enumeration.
BindingContext	Gets or sets the BindingContext for the control. (Inherited from Control)
Bottom	Gets the distance, in pixels, between the bottom edge of the control and the top edge of its container's client area. (Inherited from Control)
Bounds	Gets or sets the size and location of the control including its nonclient elements, in pixels, relative to the parent control. (Inherited from Control)
CanEnableIme	Gets a value indicating whether the ImeMode property can be set to an active value, to enable IME support. (Inherited from Control)
CanFocus	Gets a value indicating whether the control can receive focus. (Inherited from Control)
CanRaiseEvents	Determines if events can be raised on the control. (Inherited from Control)
CanSelect	Gets a value indicating whether the control can be selected. (Inherited from Control)
Capture	Gets or sets a value indicating whether the control has captured the mouse. (Inherited from Control)
CausesValidation	Gets or sets a value indicating whether the control causes validation to be performed on any controls that require validation when it receives focus. (Inherited from Control)
ClientRectangle	Gets the rectangle that represents the client area of the control. (Inherited from Control)
ClientSize	Gets or sets the height and width of the client area of the control. (Inherited from Control)
CompanyName	Gets the name of the company or creator of the application containing the control. (Inherited from Control)
Container	Gets the IContainer that contains the Component. (Inherited from Component)
ContainsFocus	Gets a value indicating whether the control, or one of its child controls, currently has the input focus. (Inherited from Control)
ContextMenu	Gets or sets the shortcut menu associated with the control. (Inherited from Control)
ContextMenuStrip	Gets or sets the ContextMenuStrip associated with this control. (Inherited from Control)
Controls	Gets the collection of controls contained within the control. (Inherited from Control)
Created	Gets a value indicating whether the control has been created. (Inherited from Control)
CreateParams	Gets the required creation parameters when the control handle is created.
Cursor	Gets or sets the cursor that is displayed when the mouse pointer is over the control. (Inherited from Control)
DataBindings	Gets the data bindings for the control. (Inherited from Control)
DataContext	Gets or sets the data context for the purpose of data binding. This is an ambient property. (Inherited from Control)
DataManager	Gets the CurrencyManager associated with this control. (Inherited from ListControl)
DataSource	Gets or sets the data source for this ComboBox.
DefaultCursor	Gets or sets the default cursor for the control. (Inherited from Control)
DefaultImeMode	Gets the default Input Method Editor (IME) mode supported by the control. (Inherited from Control)
DefaultMargin	Gets the space, in pixels, that is specified by default between controls. (Inherited from Control)
DefaultMaximumSize	Gets the length and height, in pixels, that is specified as the default maximum size of a control. (Inherited from Control)
DefaultMinimumSize	Gets the length and height, in pixels, that is specified as the default minimum size of a control. (Inherited from Control)
DefaultPadding	Gets the default internal spacing, in pixels, of the contents of a control. (Inherited from Control)
DefaultSize	Gets the default size of the control.
DesignMode	Gets a value that indicates whether the Component is currently in design mode. (Inherited from Component)
DeviceDpi	Gets the DPI value for the display device where the control is currently being displayed. (Inherited from Control)
DisplayMember	Gets or sets the property to display for this ListControl. (Inherited from ListControl)
DisplayRectangle	Gets the rectangle that represents the display area of the control. (Inherited from Control)
Disposing	Gets a value indicating whether the base Control class is in the process of disposing. (Inherited from Control)
Dock	Gets or sets which control borders are docked to its parent control and determines how a control is resized with its parent. (Inherited from Control)
DoubleBuffered	Gets or sets a value indicating whether this control should redraw its surface using a secondary buffer to reduce or prevent flicker. (Inherited from Control)
DrawMode	Gets or sets a value indicating whether your code or the operating system will handle drawing of elements in the list.
DropDownHeight	Gets or sets the height in pixels of the drop-down portion of the ComboBox.
DropDownStyle	Gets or sets a value specifying the style of the combo box.
DropDownWidth	Gets or sets the width of the of the drop-down portion of a combo box.
DroppedDown	Gets or sets a value indicating whether the combo box is displaying its drop-down portion.
Enabled	Gets or sets a value indicating whether the control can respond to user interaction. (Inherited from Control)
Events	Gets the list of event handlers that are attached to this Component. (Inherited from Component)
FlatStyle	Gets or sets the appearance of the ComboBox.
Focused	Gets a value indicating whether the ComboBox has focus.
Font	Gets or sets the font of the text displayed by the control. (Inherited from Control)
FontHeight	Gets or sets the height of the font of the control. (Inherited from Control)
ForeColor	Gets or sets the foreground color of the control.
FormatInfo	Gets or sets the IFormatProvider that provides custom formatting behavior. (Inherited from ListControl)
FormatString	Gets or sets the format-specifier characters that indicate how a value is to be displayed. (Inherited from ListControl)
FormattingEnabled	Gets or sets a value indicating whether formatting is applied to the DisplayMember property of the ListControl. (Inherited from ListControl)
Handle	Gets the window handle that the control is bound to. (Inherited from Control)
HasChildren	Gets a value indicating whether the control contains one or more child controls. (Inherited from Control)
Height	Gets or sets the height of the control. (Inherited from Control)
ImeMode	Gets or sets the Input Method Editor (IME) mode of the control. (Inherited from Control)
ImeModeBase	Gets or sets the IME mode of a control. (Inherited from Control)
IntegralHeight	Gets or sets a value indicating whether the control should resize to avoid showing partial items.
InvokeRequired	Gets a value indicating whether the caller must call an invoke method when making method calls to the control because the caller is on a different thread than the one the control was created on. (Inherited from Control)
IsAccessible	Gets or sets a value indicating whether the control is visible to accessibility applications. (Inherited from Control)
IsAncestorSiteInDesignMode	Indicates if one of the Ancestors of this control is sited and that site in DesignMode. This property is read-only. (Inherited from Control)
IsDisposed	Gets a value indicating whether the control has been disposed of. (Inherited from Control)
IsHandleCreated	Gets a value indicating whether the control has a handle associated with it. (Inherited from Control)
IsMirrored	Gets a value indicating whether the control is mirrored. (Inherited from Control)
ItemHeight	Gets or sets the height of an item in the combo box.
Items	Gets an object representing the collection of the items contained in this ComboBox.
LayoutEngine	Gets a cached instance of the control's layout engine. (Inherited from Control)
Left	Gets or sets the distance, in pixels, between the left edge of the control and the left edge of its container's client area. (Inherited from Control)
Location	Gets or sets the coordinates of the upper-left corner of the control relative to the upper-left corner of its container. (Inherited from Control)
Margin	Gets or sets the space between controls. (Inherited from Control)
MaxDropDownItems	Gets or sets the maximum number of items to be shown in the drop-down portion of the ComboBox.
MaximumSize	Gets or sets the size that is the upper limit that the GetPreferredSize(Size) method can specify.
MaxLength	Gets or sets the number of characters a user can type into the ComboBox.
MinimumSize	Gets or sets the size that is the lower limit that the GetPreferredSize(Size) method can specify.
Name	Gets or sets the name of the control. (Inherited from Control)
Padding	This property is not relevant for this class.
Parent	Gets or sets the parent container of the control. (Inherited from Control)
PreferredHeight	Gets the preferred height of the ComboBox.
PreferredSize	Gets the size of a rectangular area into which the control can fit. (Inherited from Control)
ProductName	Gets the product name of the assembly containing the control. (Inherited from Control)
ProductVersion	Gets the version of the assembly containing the control. (Inherited from Control)
RecreatingHandle	Gets a value indicating whether the control is currently re-creating its handle. (Inherited from Control)
Region	Gets or sets the window region associated with the control. (Inherited from Control)
RenderRightToLeft	Obsolete. This property is now obsolete. (Inherited from Control)
ResizeRedraw	Gets or sets a value indicating whether the control redraws itself when resized. (Inherited from Control)
Right	Gets the distance, in pixels, between the right edge of the control and the left edge of its container's client area. (Inherited from Control)
RightToLeft	Gets or sets a value indicating whether control's elements are aligned to support locales using right-to-left fonts. (Inherited from Control)
ScaleChildren	Gets a value that determines the scaling of child controls. (Inherited from Control)
SelectedIndex	Gets or sets the index specifying the currently selected item.
SelectedItem	Gets or sets currently selected item in the ComboBox.
SelectedText	Gets or sets the text that is selected in the editable portion of a ComboBox.
SelectedValue	Gets or sets the value of the member property specified by the ValueMember property. (Inherited from ListControl)
SelectionLength	Gets or sets the number of characters selected in the editable portion of the combo box.
SelectionStart	Gets or sets the starting index of text selected in the combo box.
ShowFocusCues	Gets a value indicating whether the control should display focus rectangles. (Inherited from Control)
ShowKeyboardCues	Gets a value indicating whether the user interface is in the appropriate state to show or hide keyboard accelerators. (Inherited from Control)
Site	Gets or sets the site of the control. (Inherited from Control)
Size	Gets or sets the height and width of the control. (Inherited from Control)
Sorted	Gets or sets a value indicating whether the items in the combo box are sorted.
TabIndex	Gets or sets the tab order of the control within its container. (Inherited from Control)
TabStop	Gets or sets a value indicating whether the user can give the focus to this control using the TAB key. (Inherited from Control)
Tag	Gets or sets the object that contains data about the control. (Inherited from Control)
Text	Gets or sets the text associated with this control.
Top	Gets or sets the distance, in pixels, between the top edge of the control and the top edge of its container's client area. (Inherited from Control)
TopLevelControl	Gets the parent control that is not parented by another Windows Forms control. Typically, this is the outermost Form that the control is contained in. (Inherited from Control)
UseWaitCursor	Gets or sets a value indicating whether to use the wait cursor for the current control and all child controls. (Inherited from Control)
ValueMember	Gets or sets the path of the property to use as the actual value for the items in the ListControl. (Inherited from ListControl)
Visible	Gets or sets a value indicating whether the control and all its child controls are displayed. (Inherited from Control)
Width	Gets or sets the width of the control. (Inherited from Control)
WindowTarget	This property is not relevant for this class. (Inherited from Control)

Methods

AccessibilityNotifyClients(AccessibleEvents, Int32, Int32)	Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control . (Inherited from Control)
AccessibilityNotifyClients(AccessibleEvents, Int32)	Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control. (Inherited from Control)
AddItemsCore(Object[])	Obsolete. Adds the specified items to the combo box.
BeginInvoke(Action)	Executes the specified delegate asynchronously on the thread that the control's underlying handle was created on. (Inherited from Control)
BeginInvoke(Delegate, Object[])	Executes the specified delegate asynchronously with the specified arguments, on the thread that the control's underlying handle was created on. (Inherited from Control)
BeginInvoke(Delegate)	Executes the specified delegate asynchronously on the thread that the control's underlying handle was created on. (Inherited from Control)
BeginUpdate()	Maintains performance when items are added to the ComboBox one at a time.
BringToFront()	Brings the control to the front of the z-order. (Inherited from Control)
Contains(Control)	Retrieves a value indicating whether the specified control is a child of the control. (Inherited from Control)
CreateAccessibilityInstance()	Creates a new accessibility object for the control.
CreateControl()	Forces the creation of the visible control, including the creation of the handle and any visible child controls. (Inherited from Control)
CreateControlsInstance()	Creates a new instance of the control collection for the control. (Inherited from Control)
CreateGraphics()	Creates the Graphics for the control. (Inherited from Control)
CreateHandle()	Creates a handle for the control.
CreateObjRef(Type)	Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject)
DefWndProc(Message)	Sends the specified message to the default window procedure. (Inherited from Control)
DestroyHandle()	Destroys the handle associated with the control. (Inherited from Control)
Dispose()	Releases all resources used by the Component. (Inherited from Component)
Dispose(Boolean)	Releases the unmanaged resources used by the ComboBox and optionally releases the managed resources.
DoDragDrop(Object, DragDropEffects, Bitmap, Point, Boolean)	Begins a drag operation. (Inherited from Control)
DoDragDrop(Object, DragDropEffects)	Begins a drag-and-drop operation. (Inherited from Control)
DrawToBitmap(Bitmap, Rectangle)	Supports rendering to the specified bitmap. (Inherited from Control)
EndInvoke(IAsyncResult)	Retrieves the return value of the asynchronous operation represented by the IAsyncResult passed. (Inherited from Control)
EndUpdate()	Resumes painting the ComboBox control after painting is suspended by the BeginUpdate() method.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
FilterItemOnProperty(Object, String)	Returns the current value of the ListControl item, if it is a property of an object given the item and the property name. (Inherited from ListControl)
FilterItemOnProperty(Object)	Retrieves the current value of the ListControl item, if it is a property of an object, given the item. (Inherited from ListControl)
FindForm()	Retrieves the form that the control is on. (Inherited from Control)
FindString(String, Int32)	Returns the index of the first item in the ComboBox beyond the specified index that contains the specified string. The search is not case sensitive.
FindString(String)	Returns the index of the first item in the ComboBox that starts with the specified string.
FindStringExact(String, Int32)	Finds the first item after the specified index that matches the specified string.
FindStringExact(String)	Finds the first item in the combo box that matches the specified string.
Focus()	Sets input focus to the control. (Inherited from Control)
GetAccessibilityObjectById(Int32)	Retrieves the specified AccessibleObject. (Inherited from Control)
GetAutoSizeMode()	Retrieves a value indicating how a control will behave when its AutoSize property is enabled. (Inherited from Control)
GetChildAtPoint(Point, GetChildAtPointSkip)	Retrieves the child control that is located at the specified coordinates, specifying whether to ignore child controls of a certain type. (Inherited from Control)
GetChildAtPoint(Point)	Retrieves the child control that is located at the specified coordinates. (Inherited from Control)
GetContainerControl()	Returns the next ContainerControl up the control's chain of parent controls. (Inherited from Control)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetItemHeight(Int32)	Returns the height of an item in the ComboBox.
GetItemText(Object)	Returns the text representation of the specified item. (Inherited from ListControl)
GetLifetimeService()	Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject)
GetNextControl(Control, Boolean)	Retrieves the next control forward or back in the tab order of child controls. (Inherited from Control)
GetPreferredSize(Size)	Retrieves the size of a rectangular area into which a control can be fitted. (Inherited from Control)
GetScaledBounds(Rectangle, SizeF, BoundsSpecified)	Retrieves the bounds within which the control is scaled. (Inherited from Control)
GetService(Type)	Returns an object that represents a service provided by the Component or by its Container. (Inherited from Component)
GetStyle(ControlStyles)	Retrieves the value of the specified control style bit for the control. (Inherited from Control)
GetTopLevel()	Determines if the control is a top-level control. (Inherited from Control)
GetType()	Gets the Type of the current instance. (Inherited from Object)
Hide()	Conceals the control from the user. (Inherited from Control)
InitializeLifetimeService()	Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject)
InitLayout()	Called after the control has been added to another container. (Inherited from Control)
Invalidate()	Invalidates the entire surface of the control and causes the control to be redrawn. (Inherited from Control)
Invalidate(Boolean)	Invalidates a specific region of the control and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control. (Inherited from Control)
Invalidate(Rectangle, Boolean)	Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control. (Inherited from Control)
Invalidate(Rectangle)	Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. (Inherited from Control)
Invalidate(Region, Boolean)	Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. Optionally, invalidates the child controls assigned to the control. (Inherited from Control)
Invalidate(Region)	Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control. (Inherited from Control)
Invoke(Action)	Executes the specified delegate on the thread that owns the control's underlying window handle. (Inherited from Control)
Invoke(Delegate, Object[])	Executes the specified delegate, on the thread that owns the control's underlying window handle, with the specified list of arguments. (Inherited from Control)
Invoke(Delegate)	Executes the specified delegate on the thread that owns the control's underlying window handle. (Inherited from Control)
Invoke<T>(Func<T>)	Executes the specified delegate on the thread that owns the control's underlying window handle. (Inherited from Control)
InvokeAsync(Action, CancellationToken)	Invokes the specified synchronous callback asynchronously on the thread that owns the control's handle. (Inherited from Control)
InvokeAsync(Func<CancellationToken,ValueTask>, CancellationToken)	Executes the specified asynchronous callback on the thread that owns the control's handle asynchronously. (Inherited from Control)
InvokeAsync<T>(Func<CancellationToken,ValueTask<T>>, CancellationToken)	Executes the specified asynchronous callback on the thread that owns the control's handle. (Inherited from Control)
InvokeAsync<T>(Func<T>, CancellationToken)	Invokes the specified synchronous callback asynchronously on the thread that owns the control's handle. (Inherited from Control)
InvokeGotFocus(Control, EventArgs)	Raises the GotFocus event for the specified control. (Inherited from Control)
InvokeLostFocus(Control, EventArgs)	Raises the LostFocus event for the specified control. (Inherited from Control)
InvokeOnClick(Control, EventArgs)	Raises the Click event for the specified control. (Inherited from Control)
InvokePaint(Control, PaintEventArgs)	Raises the Paint event for the specified control. (Inherited from Control)
InvokePaintBackground(Control, PaintEventArgs)	Raises the PaintBackground event for the specified control. (Inherited from Control)
IsInputChar(Char)	Determines if a character is an input character that the control recognizes. (Inherited from Control)
IsInputKey(Keys)	Determines whether the specified key is a regular input key or a special key that requires preprocessing.
LogicalToDeviceUnits(Int32)	Converts a Logical DPI value to its equivalent DeviceUnit DPI value. (Inherited from Control)
LogicalToDeviceUnits(Size)	Transforms a size from logical to device units by scaling it for the current DPI and rounding down to the nearest integer value for width and height. (Inherited from Control)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
MemberwiseClone(Boolean)	Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject)
NotifyInvalidate(Rectangle)	Raises the Invalidated event with a specified region of the control to invalidate. (Inherited from Control)
OnAutoSizeChanged(EventArgs)	Raises the AutoSizeChanged event. (Inherited from Control)
OnBackColorChanged(EventArgs)	Raises the BackColorChanged event.
OnBackgroundImageChanged(EventArgs)	Raises the BackgroundImageChanged event. (Inherited from Control)
OnBackgroundImageLayoutChanged(EventArgs)	Raises the BackgroundImageLayoutChanged event. (Inherited from Control)
OnBindingContextChanged(EventArgs)	Raises the BindingContextChanged event. (Inherited from ListControl)
OnCausesValidationChanged(EventArgs)	Raises the CausesValidationChanged event. (Inherited from Control)
OnChangeUICues(UICuesEventArgs)	Raises the ChangeUICues event. (Inherited from Control)
OnClick(EventArgs)	Raises the Click event. (Inherited from Control)
OnClientSizeChanged(EventArgs)	Raises the ClientSizeChanged event. (Inherited from Control)
OnContextMenuChanged(EventArgs)	Raises the ContextMenuChanged event. (Inherited from Control)
OnContextMenuStripChanged(EventArgs)	Raises the ContextMenuStripChanged event. (Inherited from Control)
OnControlAdded(ControlEventArgs)	Raises the ControlAdded event. (Inherited from Control)
OnControlRemoved(ControlEventArgs)	Raises the ControlRemoved event. (Inherited from Control)
OnCreateControl()	Raises the CreateControl() method. (Inherited from Control)
OnCursorChanged(EventArgs)	Raises the CursorChanged event. (Inherited from Control)
OnDataContextChanged(EventArgs)	(Inherited from Control)
OnDataSourceChanged(EventArgs)	Raises the DataSourceChanged event.
OnDisplayMemberChanged(EventArgs)	Raises the DisplayMemberChanged event.
OnDockChanged(EventArgs)	Raises the DockChanged event. (Inherited from Control)
OnDoubleClick(EventArgs)	Raises the DoubleClick event. (Inherited from Control)
OnDpiChangedAfterParent(EventArgs)	Raises the DpiChangedAfterParent event. (Inherited from Control)
OnDpiChangedBeforeParent(EventArgs)	Raises the DpiChangedBeforeParent event. (Inherited from Control)
OnDragDrop(DragEventArgs)	Raises the DragDrop event. (Inherited from Control)
OnDragEnter(DragEventArgs)	Raises the DragEnter event. (Inherited from Control)
OnDragLeave(EventArgs)	Raises the DragLeave event. (Inherited from Control)
OnDragOver(DragEventArgs)	Raises the DragOver event. (Inherited from Control)
OnDrawItem(DrawItemEventArgs)	Raises the DrawItem event.
OnDropDown(EventArgs)	Raises the DropDown event.
OnDropDownClosed(EventArgs)	Raises the DropDownClosed event.
OnDropDownStyleChanged(EventArgs)	Raises the DropDownStyleChanged event.
OnEnabledChanged(EventArgs)	Raises the EnabledChanged event. (Inherited from Control)
OnEnter(EventArgs)	Raises the Enter event. (Inherited from Control)
OnFontChanged(EventArgs)	Raises the FontChanged event.
OnForeColorChanged(EventArgs)	Raises the ForeColorChanged event.
OnFormat(ListControlConvertEventArgs)	Raises the Format event. (Inherited from ListControl)
OnFormatInfoChanged(EventArgs)	Raises the FormatInfoChanged event. (Inherited from ListControl)
OnFormatStringChanged(EventArgs)	Raises the FormatStringChanged event. (Inherited from ListControl)
OnFormattingEnabledChanged(EventArgs)	Raises the FormattingEnabledChanged event. (Inherited from ListControl)
OnGiveFeedback(GiveFeedbackEventArgs)	Raises the GiveFeedback event. (Inherited from Control)
OnGotFocus(EventArgs)	Raises the GotFocus event.
OnHandleCreated(EventArgs)	Raises the HandleCreated event.
OnHandleDestroyed(EventArgs)	Raises the HandleDestroyed event.
OnHelpRequested(HelpEventArgs)	Raises the HelpRequested event. (Inherited from Control)
OnImeModeChanged(EventArgs)	Raises the ImeModeChanged event. (Inherited from Control)
OnInvalidated(InvalidateEventArgs)	Raises the Invalidated event. (Inherited from Control)
OnKeyDown(KeyEventArgs)	Raises the KeyDown event.
OnKeyPress(KeyPressEventArgs)	Raises the KeyPress event.
OnKeyUp(KeyEventArgs)
OnLayout(LayoutEventArgs)	Raises the Layout event. (Inherited from Control)
OnLeave(EventArgs)	Raises the Leave event. (Inherited from Control)
OnLocationChanged(EventArgs)	Raises the LocationChanged event. (Inherited from Control)
OnLostFocus(EventArgs)	Raises the LostFocus event.
OnMarginChanged(EventArgs)	Raises the MarginChanged event. (Inherited from Control)
OnMeasureItem(MeasureItemEventArgs)	Raises the MeasureItem event.
OnMouseCaptureChanged(EventArgs)	Raises the MouseCaptureChanged event. (Inherited from Control)
OnMouseClick(MouseEventArgs)	Raises the MouseClick event. (Inherited from Control)
OnMouseDoubleClick(MouseEventArgs)	Raises the MouseDoubleClick event. (Inherited from Control)
OnMouseDown(MouseEventArgs)
OnMouseEnter(EventArgs)	Raises the MouseEnter event.
OnMouseHover(EventArgs)	Raises the MouseHover event. (Inherited from Control)
OnMouseLeave(EventArgs)	Raises the MouseLeave event.
OnMouseMove(MouseEventArgs)	Raises the MouseMove event. (Inherited from Control)
OnMouseUp(MouseEventArgs)	Raises the MouseUp event. (Inherited from Control)
OnMouseWheel(MouseEventArgs)	Raises the MouseWheel event. (Inherited from Control)
OnMove(EventArgs)	Raises the Move event. (Inherited from Control)
OnNotifyMessage(Message)	Notifies the control of Windows messages. (Inherited from Control)
OnPaddingChanged(EventArgs)	Raises the PaddingChanged event. (Inherited from Control)
OnPaint(PaintEventArgs)	Raises the Paint event. (Inherited from Control)
OnPaintBackground(PaintEventArgs)	Paints the background of the control. (Inherited from Control)
OnParentBackColorChanged(EventArgs)	Raises the BackColorChanged event.
OnParentBackgroundImageChanged(EventArgs)	Raises the BackgroundImageChanged event when the BackgroundImage property value of the control's container changes. (Inherited from Control)
OnParentBindingContextChanged(EventArgs)	Raises the BindingContextChanged event when the BindingContext property value of the control's container changes. (Inherited from Control)
OnParentChanged(EventArgs)	Raises the ParentChanged event. (Inherited from Control)
OnParentCursorChanged(EventArgs)	Raises the CursorChanged event. (Inherited from Control)
OnParentDataContextChanged(EventArgs)	(Inherited from Control)
OnParentEnabledChanged(EventArgs)	Raises the EnabledChanged event when the Enabled property value of the control's container changes. (Inherited from Control)
OnParentFontChanged(EventArgs)	Raises the FontChanged event when the Font property value of the control's container changes. (Inherited from Control)
OnParentForeColorChanged(EventArgs)	Raises the ForeColorChanged event when the ForeColor property value of the control's container changes. (Inherited from Control)
OnParentRightToLeftChanged(EventArgs)	Raises the RightToLeftChanged event when the RightToLeft property value of the control's container changes. (Inherited from Control)
OnParentVisibleChanged(EventArgs)	Raises the VisibleChanged event when the Visible property value of the control's container changes. (Inherited from Control)
OnPreviewKeyDown(PreviewKeyDownEventArgs)	Raises the PreviewKeyDown event. (Inherited from Control)
OnPrint(PaintEventArgs)	Raises the Paint event. (Inherited from Control)
OnQueryContinueDrag(QueryContinueDragEventArgs)	Raises the QueryContinueDrag event. (Inherited from Control)
OnRegionChanged(EventArgs)	Raises the RegionChanged event. (Inherited from Control)
OnResize(EventArgs)	Raises the Resize event.
OnRightToLeftChanged(EventArgs)	Raises the RightToLeftChanged event. (Inherited from Control)
OnSelectedIndexChanged(EventArgs)	Raises the SelectedIndexChanged event.
OnSelectedItemChanged(EventArgs)	Raises the SelectedItemChanged event.
OnSelectedValueChanged(EventArgs)	Raises the SelectedValueChanged event.
OnSelectionChangeCommitted(EventArgs)	Raises the SelectionChangeCommitted event.
OnSizeChanged(EventArgs)	Raises the SizeChanged event. (Inherited from Control)
OnStyleChanged(EventArgs)	Raises the StyleChanged event. (Inherited from Control)
OnSystemColorsChanged(EventArgs)	Raises the SystemColorsChanged event. (Inherited from Control)
OnTabIndexChanged(EventArgs)	Raises the TabIndexChanged event. (Inherited from Control)
OnTabStopChanged(EventArgs)	Raises the TabStopChanged event. (Inherited from Control)
OnTextChanged(EventArgs)	Raises the TextChanged event.
OnTextUpdate(EventArgs)	Raises the TextUpdate event.
OnValidated(EventArgs)	Raises the Validated event. (Inherited from Control)
OnValidating(CancelEventArgs)	Raises the Validating event.
OnValueMemberChanged(EventArgs)	Raises the ValueMemberChanged event. (Inherited from ListControl)
OnVisibleChanged(EventArgs)	Raises the VisibleChanged event. (Inherited from Control)
PerformLayout()	Forces the control to apply layout logic to all its child controls. (Inherited from Control)
PerformLayout(Control, String)	Forces the control to apply layout logic to all its child controls. (Inherited from Control)
PointToClient(Point)	Computes the location of the specified screen point into client coordinates. (Inherited from Control)
PointToScreen(Point)	Computes the location of the specified client point into screen coordinates. (Inherited from Control)
PreProcessControlMessage(Message)	Preprocesses keyboard or input messages within the message loop before they are dispatched. (Inherited from Control)
PreProcessMessage(Message)	Preprocesses keyboard or input messages within the message loop before they are dispatched. (Inherited from Control)
ProcessCmdKey(Message, Keys)	Processes a command key.
ProcessDialogChar(Char)	Processes a dialog character. (Inherited from Control)
ProcessDialogKey(Keys)	Processes a dialog key. (Inherited from Control)
ProcessKeyEventArgs(Message)	Processes a key message and generates the appropriate control events.
ProcessKeyMessage(Message)	Processes a keyboard message. (Inherited from Control)
ProcessKeyPreview(Message)	Previews a keyboard message. (Inherited from Control)
ProcessMnemonic(Char)	Processes a mnemonic character. (Inherited from Control)
RaiseDragEvent(Object, DragEventArgs)	Raises the appropriate drag event. (Inherited from Control)
RaiseKeyEvent(Object, KeyEventArgs)	Raises the appropriate key event. (Inherited from Control)
RaiseMouseEvent(Object, MouseEventArgs)	Raises the appropriate mouse event. (Inherited from Control)
RaisePaintEvent(Object, PaintEventArgs)	Raises the appropriate paint event. (Inherited from Control)
RecreateHandle()	Forces the re-creation of the handle for the control. (Inherited from Control)
RectangleToClient(Rectangle)	Computes the size and location of the specified screen rectangle in client coordinates. (Inherited from Control)
RectangleToScreen(Rectangle)	Computes the size and location of the specified client rectangle in screen coordinates. (Inherited from Control)
Refresh()	Forces the control to invalidate its client area and immediately redraw itself and any child controls. (Inherited from Control)
RefreshItem(Int32)	Refreshes the item contained at the specified location.
RefreshItems()	Refreshes all ComboBox items.
RescaleConstantsForDpi(Int32, Int32)	Provides constants for rescaling the control when a DPI change occurs. (Inherited from Control)
ResetBackColor()	Resets the BackColor property to its default value. (Inherited from Control)
ResetBindings()	Causes a control bound to the BindingSource to reread all the items in the list and refresh their displayed values. (Inherited from Control)
ResetCursor()	Resets the Cursor property to its default value. (Inherited from Control)
ResetFont()	Resets the Font property to its default value. (Inherited from Control)
ResetForeColor()	Resets the ForeColor property to its default value. (Inherited from Control)
ResetImeMode()	Resets the ImeMode property to its default value. (Inherited from Control)
ResetMouseEventArgs()	Resets the control to handle the MouseLeave event. (Inherited from Control)
ResetRightToLeft()	Resets the RightToLeft property to its default value. (Inherited from Control)
ResetText()	Resets the Text property to its default value (Empty).
ResumeLayout()	Resumes usual layout logic. (Inherited from Control)
ResumeLayout(Boolean)	Resumes usual layout logic, optionally forcing an immediate layout of pending layout requests. (Inherited from Control)
RtlTranslateAlignment(ContentAlignment)	Converts the specified ContentAlignment to the appropriate ContentAlignment to support right-to-left text. (Inherited from Control)
RtlTranslateAlignment(HorizontalAlignment)	Converts the specified HorizontalAlignment to the appropriate HorizontalAlignment to support right-to-left text. (Inherited from Control)
RtlTranslateAlignment(LeftRightAlignment)	Converts the specified LeftRightAlignment to the appropriate LeftRightAlignment to support right-to-left text. (Inherited from Control)
RtlTranslateContent(ContentAlignment)	Converts the specified ContentAlignment to the appropriate ContentAlignment to support right-to-left text. (Inherited from Control)
RtlTranslateHorizontal(HorizontalAlignment)	Converts the specified HorizontalAlignment to the appropriate HorizontalAlignment to support right-to-left text. (Inherited from Control)
RtlTranslateLeftRight(LeftRightAlignment)	Converts the specified LeftRightAlignment to the appropriate LeftRightAlignment to support right-to-left text. (Inherited from Control)
Scale(Single, Single)	Obsolete. Scales the entire control and any child controls. (Inherited from Control)
Scale(Single)	Obsolete. Scales the control and any child controls. (Inherited from Control)
Scale(SizeF)	Scales the control and all child controls by the specified scaling factor. (Inherited from Control)
ScaleBitmapLogicalToDevice(Bitmap)	Scales a logical bitmap value to it's equivalent device unit value when a DPI change occurs. (Inherited from Control)
ScaleControl(SizeF, BoundsSpecified)	Scales a control's location, size, padding, and margin.
ScaleCore(Single, Single)	This method is not relevant for this class. (Inherited from Control)
Select()	Activates the control. (Inherited from Control)
Select(Boolean, Boolean)	Activates a child control. Optionally specifies the direction in the tab order to select the control from. (Inherited from Control)
Select(Int32, Int32)	Selects a range of text in the editable portion of the ComboBox.
SelectAll()	Selects all the text in the editable portion of the ComboBox.
SelectNextControl(Control, Boolean, Boolean, Boolean, Boolean)	Activates the next control. (Inherited from Control)
SendToBack()	Sends the control to the back of the z-order. (Inherited from Control)
SetAutoSizeMode(AutoSizeMode)	Sets a value indicating how a control will behave when its AutoSize property is enabled. (Inherited from Control)
SetBounds(Int32, Int32, Int32, Int32, BoundsSpecified)	Sets the specified bounds of the control to the specified location and size. (Inherited from Control)
SetBounds(Int32, Int32, Int32, Int32)	Sets the bounds of the control to the specified location and size. (Inherited from Control)
SetBoundsCore(Int32, Int32, Int32, Int32, BoundsSpecified)	Sets the size and location of the ComboBox.
SetClientSizeCore(Int32, Int32)	Sets the size of the client area of the control. (Inherited from Control)
SetItemCore(Int32, Object)	When overridden in a derived class, sets the object with the specified index in the derived class.
SetItemsCore(IList)	When overridden in a derived class, sets the specified array of objects in a collection in the derived class.
SetStyle(ControlStyles, Boolean)	Sets a specified ControlStyles flag to either true or false. (Inherited from Control)
SetTopLevel(Boolean)	Sets the control as the top-level control. (Inherited from Control)
SetVisibleCore(Boolean)	Sets the control to the specified visible state. (Inherited from Control)
Show()	Displays the control to the user. (Inherited from Control)
SizeFromClientSize(Size)	Determines the size of the entire control from the height and width of its client area. (Inherited from Control)
SuspendLayout()	Temporarily suspends the layout logic for the control. (Inherited from Control)
ToString()	Returns a string that represents the ComboBox control.
Update()	Causes the control to redraw the invalidated regions within its client area. (Inherited from Control)
UpdateBounds()	Updates the bounds of the control with the current size and location. (Inherited from Control)
UpdateBounds(Int32, Int32, Int32, Int32, Int32, Int32)	Updates the bounds of the control with the specified size, location, and client size. (Inherited from Control)
UpdateBounds(Int32, Int32, Int32, Int32)	Updates the bounds of the control with the specified size and location. (Inherited from Control)
UpdateStyles()	Forces the assigned styles to be reapplied to the control. (Inherited from Control)
UpdateZOrder()	Updates the control in its parent's z-order. (Inherited from Control)
WndProc(Message)	Processes Windows messages.

Events

AutoSizeChanged	This event is not relevant for this class. (Inherited from Control)
BackColorChanged	Occurs when the value of the BackColor property changes. (Inherited from Control)
BackgroundImageChanged	Occurs when the value of the BackgroundImage property changes.
BackgroundImageLayoutChanged	Occurs when the BackgroundImageLayout property changes.
BindingContextChanged	Occurs when the value of the BindingContext property changes. (Inherited from Control)
CausesValidationChanged	Occurs when the value of the CausesValidation property changes. (Inherited from Control)
ChangeUICues	Occurs when the focus or keyboard user interface (UI) cues change. (Inherited from Control)
Click	Occurs when the control is clicked. (Inherited from Control)
ClientSizeChanged	Occurs when the value of the ClientSize property changes. (Inherited from Control)
ContextMenuChanged	Occurs when the value of the ContextMenu property changes. (Inherited from Control)
ContextMenuStripChanged	Occurs when the value of the ContextMenuStrip property changes. (Inherited from Control)
ControlAdded	Occurs when a new control is added to the Control.ControlCollection. (Inherited from Control)
ControlRemoved	Occurs when a control is removed from the Control.ControlCollection. (Inherited from Control)
CursorChanged	Occurs when the value of the Cursor property changes. (Inherited from Control)
DataContextChanged	Occurs when the value of the DataContext property changes. (Inherited from Control)
DataSourceChanged	Occurs when the DataSource changes. (Inherited from ListControl)
DisplayMemberChanged	Occurs when the DisplayMember property changes. (Inherited from ListControl)
Disposed	Occurs when the component is disposed by a call to the Dispose() method. (Inherited from Component)
DockChanged	Occurs when the value of the Dock property changes. (Inherited from Control)
DoubleClick	This event is not relevant for this class.
DpiChangedAfterParent	Occurs when the DPI setting for a control is changed programmatically after the DPI of its parent control or form has changed. (Inherited from Control)
DpiChangedBeforeParent	Occurs when the DPI setting for a control is changed programmatically before a DPI change event for its parent control or form has occurred. (Inherited from Control)
DragDrop	Occurs when a drag-and-drop operation is completed. (Inherited from Control)
DragEnter	Occurs when an object is dragged into the control's bounds. (Inherited from Control)
DragLeave	Occurs when an object is dragged out of the control's bounds. (Inherited from Control)
DragOver	Occurs when an object is dragged over the control's bounds. (Inherited from Control)
DrawItem	Occurs when a visual aspect of an owner-drawn ComboBox changes.
DropDown	Occurs when the drop-down portion of a ComboBox is shown.
DropDownClosed	Occurs when the drop-down portion of the ComboBox is no longer visible.
DropDownStyleChanged	Occurs when the DropDownStyle property has changed.
EnabledChanged	Occurs when the Enabled property value has changed. (Inherited from Control)
Enter	Occurs when the control is entered. (Inherited from Control)
FontChanged	Occurs when the Font property value changes. (Inherited from Control)
ForeColorChanged	Occurs when the ForeColor property value changes. (Inherited from Control)
Format	Occurs when the control is bound to a data value. (Inherited from ListControl)
FormatInfoChanged	Occurs when the value of the FormatInfo property changes. (Inherited from ListControl)
FormatStringChanged	Occurs when value of the FormatString property changes. (Inherited from ListControl)
FormattingEnabledChanged	Occurs when the value of the FormattingEnabled property changes. (Inherited from ListControl)
GiveFeedback	Occurs during a drag operation. (Inherited from Control)
GotFocus	Occurs when the control receives focus. (Inherited from Control)
HandleCreated	Occurs when a handle is created for the control. (Inherited from Control)
HandleDestroyed	Occurs when the control's handle is in the process of being destroyed. (Inherited from Control)
HelpRequested	Occurs when the user requests help for a control. (Inherited from Control)
ImeModeChanged	Occurs when the ImeMode property has changed. (Inherited from Control)
Invalidated	Occurs when a control's display requires redrawing. (Inherited from Control)
KeyDown	Occurs when a key is pressed while the control has focus. (Inherited from Control)
KeyPress	Occurs when a character, space, or backspace key is pressed while the control has focus. (Inherited from Control)
KeyUp	Occurs when a key is released while the control has focus. (Inherited from Control)
Layout	Occurs when a control should reposition its child controls. (Inherited from Control)
Leave	Occurs when the input focus leaves the control. (Inherited from Control)
LocationChanged	Occurs when the Location property value has changed. (Inherited from Control)
LostFocus	Occurs when the control loses focus. (Inherited from Control)
MarginChanged	Occurs when the control's margin changes. (Inherited from Control)
MeasureItem	Occurs each time an owner-drawn ComboBox item needs to be drawn and when the sizes of the list items are determined.
MouseCaptureChanged	Occurs when the control loses mouse capture. (Inherited from Control)
MouseClick	Occurs when the control is clicked by the mouse. (Inherited from Control)
MouseDoubleClick	Occurs when the control is double clicked by the mouse. (Inherited from Control)
MouseDown	Occurs when the mouse pointer is over the control and a mouse button is pressed. (Inherited from Control)
MouseEnter	Occurs when the mouse pointer enters the control. (Inherited from Control)
MouseHover	Occurs when the mouse pointer rests on the control. (Inherited from Control)
MouseLeave	Occurs when the mouse pointer leaves the control. (Inherited from Control)
MouseMove	Occurs when the mouse pointer is moved over the control. (Inherited from Control)
MouseUp	Occurs when the mouse pointer is over the control and a mouse button is released. (Inherited from Control)
MouseWheel	Occurs when the mouse wheel moves while the control has focus. (Inherited from Control)
Move	Occurs when the control is moved. (Inherited from Control)
PaddingChanged	This event is not relevant to this class.
Paint	Occurs when the ComboBox control is redrawn.
ParentChanged	Occurs when the Parent property value changes. (Inherited from Control)
PreviewKeyDown	Occurs before the KeyDown event when a key is pressed while focus is on this control. (Inherited from Control)
QueryAccessibilityHelp	Occurs when AccessibleObject is providing help to accessibility applications. (Inherited from Control)
QueryContinueDrag	Occurs during a drag-and-drop operation and enables the drag source to determine whether the drag-and-drop operation should be canceled. (Inherited from Control)
RegionChanged	Occurs when the value of the Region property changes. (Inherited from Control)
Resize	Occurs when the control is resized. (Inherited from Control)
RightToLeftChanged	Occurs when the RightToLeft property value changes. (Inherited from Control)
SelectedIndexChanged	Occurs when the SelectedIndex property has changed.
SelectedValueChanged	Occurs when the SelectedValue property changes. (Inherited from ListControl)
SelectionChangeCommitted	Occurs when the user changes the selected item and that change is displayed in the ComboBox.
SizeChanged	Occurs when the Size property value changes. (Inherited from Control)
StyleChanged	Occurs when the control style changes. (Inherited from Control)
SystemColorsChanged	Occurs when the system colors change. (Inherited from Control)
TabIndexChanged	Occurs when the TabIndex property value changes. (Inherited from Control)
TabStopChanged	Occurs when the TabStop property value changes. (Inherited from Control)
TextChanged	Occurs when the Text property value changes. (Inherited from Control)
TextUpdate	Occurs when the control has formatted the text, but before the text is displayed.
Validated	Occurs when the control is finished validating. (Inherited from Control)
Validating	Occurs when the control is validating. (Inherited from Control)
ValueMemberChanged	Occurs when the ValueMember property changes. (Inherited from ListControl)
VisibleChanged	Occurs when the Visible property value changes. (Inherited from Control)

Explicit Interface Implementations

IDropTarget.OnDragDrop(DragEventArgs)	Raises the DragDrop event. (Inherited from Control)
IDropTarget.OnDragEnter(DragEventArgs)	Raises the DragEnter event. (Inherited from Control)
IDropTarget.OnDragLeave(EventArgs)	Raises the DragLeave event. (Inherited from Control)
IDropTarget.OnDragOver(DragEventArgs)	Raises the DragOver event. (Inherited from Control)