UpdatePanel Class

Reference

Definition

Namespace:: System.Web.UI

Assembly:: System.Web.Extensions.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Enables sections of a page to be partially rendered without a postback.

public ref class UpdatePanel : System::Web::UI::Control

public ref class UpdatePanel : System::Web::UI::Control, System::Web::UI::IAttributeAccessor

[System.Drawing.ToolboxBitmap(typeof(EmbeddedResourceFinder), "System.Web.Resources.UpdatePanel.bmp")]
public class UpdatePanel : System.Web.UI.Control

[System.Drawing.ToolboxBitmap(typeof(EmbeddedResourceFinder), "System.Web.Resources.UpdatePanel.bmp")]
public class UpdatePanel : System.Web.UI.Control, System.Web.UI.IAttributeAccessor

[<System.Drawing.ToolboxBitmap(typeof(EmbeddedResourceFinder), "System.Web.Resources.UpdatePanel.bmp")>]
type UpdatePanel = class
    inherit Control

[<System.Drawing.ToolboxBitmap(typeof(EmbeddedResourceFinder), "System.Web.Resources.UpdatePanel.bmp")>]
type UpdatePanel = class
    inherit Control
    interface IAttributeAccessor

Public Class UpdatePanel
Inherits Control

Public Class UpdatePanel
Inherits Control
Implements IAttributeAccessor

Inheritance: Object

Control
UpdatePanel

Attributes: ToolboxBitmapAttribute

Implements: IAttributeAccessor

Examples

The following examples show various uses of the UpdatePanel control.

Controls Inside an UpdatePanel Control

The following example shows how to put controls inside an UpdatePanel control to reduce screen flicker when you post to the server. In this example, a Calendar and a DropDownList control are inside an UpdatePanel control. By default, the UpdateMode property is Always and the ChildrenAsTriggers property is true. Therefore, child controls of the panel cause an asynchronous postback.


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    void DropDownSelection_Change(Object sender, EventArgs e)
    {
        Calendar1.DayStyle.BackColor =
            System.Drawing.Color.FromName(ColorList.SelectedItem.Value);
    }

    protected void Calendar1_SelectionChanged(object sender, EventArgs e)
    {
        SelectedDate.Text = 
            Calendar1.SelectedDate.ToString();
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>UpdatePanel Example</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1" 
                               runat="server" />
            <asp:UpdatePanel ID="UpdatePanel1"
                             runat="server">
                <ContentTemplate>
                    <asp:Calendar ID="Calendar1" 
                                  ShowTitle="True"
                                  OnSelectionChanged="Calendar1_SelectionChanged"
                                  runat="server" />
                    <div>
                        Background:
                        <br />
                        <asp:DropDownList ID="ColorList" 
                                          AutoPostBack="True" 
                                          OnSelectedIndexChanged="DropDownSelection_Change"
                                          runat="server">
                            <asp:ListItem Selected="True" Value="White"> 
                            White </asp:ListItem>
                            <asp:ListItem Value="Silver"> 
                            Silver </asp:ListItem>
                            <asp:ListItem Value="DarkGray"> 
                            Dark Gray </asp:ListItem>
                            <asp:ListItem Value="Khaki"> 
                            Khaki </asp:ListItem>
                            <asp:ListItem Value="DarkKhaki"> D
                            ark Khaki </asp:ListItem>
                        </asp:DropDownList>
                    </div>
                    <br />
                    Selected date:
                    <asp:Label ID="SelectedDate" 
                               runat="server">None.</asp:Label>
                </ContentTemplate>
            </asp:UpdatePanel>
            <br />
        </div>
    </form>
</body>
</html>


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    Sub DropDownSelection_Change(ByVal Sender As Object, ByVal E As EventArgs)
        Calendar1.DayStyle.BackColor = _
        System.Drawing.Color.FromName(ColorList.SelectedItem.Value)
    End Sub

    Protected Sub Calendar1_SelectionChanged(ByVal Sender As Object, ByVal E As EventArgs)
        SelectedDate.Text = Calendar1.SelectedDate.ToString()
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>UpdatePanel Example</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1" 
                               runat="server" />
            <asp:UpdatePanel ID="UpdatePanel1"
                             runat="server">
                <ContentTemplate>
                    <asp:Calendar ID="Calendar1" 
                                  ShowTitle="True"
                                  OnSelectionChanged="Calendar1_SelectionChanged"
                                  runat="server" />
                    <div>
                        Background:
                        <br />
                        <asp:DropDownList ID="ColorList" 
                                          AutoPostBack="True" 
                                          OnSelectedIndexChanged="DropDownSelection_Change"
                                          runat="server">
                            <asp:ListItem Selected="True" Value="White"> 
                            White </asp:ListItem>
                            <asp:ListItem Value="Silver"> 
                            Silver </asp:ListItem>
                            <asp:ListItem Value="DarkGray"> 
                            Dark Gray </asp:ListItem>
                            <asp:ListItem Value="Khaki"> 
                            Khaki </asp:ListItem>
                            <asp:ListItem Value="DarkKhaki"> D
                            ark Khaki </asp:ListItem>
                        </asp:DropDownList>
                    </div>
                    <br />
                    Selected date:
                    <asp:Label ID="SelectedDate" 
                               runat="server">None.</asp:Label>
                </ContentTemplate>
            </asp:UpdatePanel>
            <br />
        </div>
    </form>
</body>
</html>

Master/Detail Scenario with UpdatePanel Controls

In the following example, an UpdatePanel control is used in a master/detail scenario that shows orders and order details from the Northwind database. One UpdatePanel control contains the GridView control that displays a list of orders. A second UpdatePanel control contains a DetailsView control that displays the details of one order. When you select an order from the first table, details for that order are displayed in the second table. The second table is updated asynchronously based on the selection in the first table. The sorting and paging operations in the orders summary table also cause partial updates.

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        SqlDataSource2.SelectParameters["OrderID"].DefaultValue = 
            GridView1.SelectedDataKey.Value.ToString();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>UpdatePanel Example</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1"
                               runat="server" />
            <asp:UpdatePanel ID="OrdersPanel"
                             UpdateMode="Conditional"
                             runat="server">
                <ContentTemplate>
                    <asp:GridView ID="GridView1" 
                                  AllowPaging="True"
                                  AllowSorting="True"
                                  Caption="Orders"
                                  DataKeyNames="OrderID"
                                  DataSourceID="SqlDataSource1"
                                  OnSelectedIndexChanged="GridView1_SelectedIndexChanged"
                                  runat="server" >
                    <Columns>
                    <asp:CommandField ShowSelectButton="True"></asp:CommandField>
                    </Columns>
                    </asp:GridView>
                    <asp:SqlDataSource ID="SqlDataSource1"
                                       runat="server"
                                       ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
                                       SelectCommand="SELECT [OrderID], [CustomerID], [EmployeeID], [OrderDate] FROM [Orders]">
                    </asp:SqlDataSource>
                </ContentTemplate>
            </asp:UpdatePanel>
            <asp:UpdatePanel ID="OrderDetailsPanel"
                             UpdateMode="Always"
                             runat="server">
                <ContentTemplate>
                    <asp:DetailsView ID="DetailsView1"
                                     Caption="Order Details"
                                     DataKeyNames="OrderID,ProductID"
                                     DataSourceID="SqlDataSource2"
                                     runat="server">
                        <EmptyDataTemplate>
                        <i>Select a row from the Orders table.</i>
                        </EmptyDataTemplate>
                    </asp:DetailsView>
                    <asp:SqlDataSource ID="SqlDataSource2"
                                       ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
                                       SelectCommand="SELECT [OrderID], [ProductID], [UnitPrice], [Quantity], [Discount] FROM [Order Details] WHERE ([OrderID] = @OrderID)"
                                       runat="server">
                        <SelectParameters>
                            <asp:Parameter Name="OrderID"
                                           Type="Int32" />
                        </SelectParameters>
                    </asp:SqlDataSource>
                </ContentTemplate>
            </asp:UpdatePanel>
        </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
        SqlDataSource2.SelectParameters("OrderID").DefaultValue = _
        GridView1.SelectedDataKey.Value.ToString()
    End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>UpdatePanel Example</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1"
                               runat="server" />
            <asp:UpdatePanel ID="OrdersPanel"
                             UpdateMode="Conditional"
                             runat="server">
                <ContentTemplate>
                    <asp:GridView ID="GridView1" 
                                  AllowPaging="True"
                                  AllowSorting="True"
                                  Caption="Orders"
                                  DataKeyNames="OrderID"
                                  DataSourceID="SqlDataSource1"
                                  OnSelectedIndexChanged="GridView1_SelectedIndexChanged"
                                  runat="server" >
                    <Columns>
                    <asp:CommandField ShowSelectButton="True"></asp:CommandField>
                    </Columns>
                    </asp:GridView>
                    <asp:SqlDataSource ID="SqlDataSource1"
                                       runat="server"
                                       ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
                                       SelectCommand="SELECT [OrderID], [CustomerID], [EmployeeID], [OrderDate] FROM [Orders]">
                    </asp:SqlDataSource>
                </ContentTemplate>
            </asp:UpdatePanel>
            <asp:UpdatePanel ID="OrderDetailsPanel"
                             UpdateMode="Always"
                             runat="server">
                <ContentTemplate>
                    <asp:DetailsView ID="DetailsView1"
                                     Caption="Order Details"
                                     DataKeyNames="OrderID,ProductID"
                                     DataSourceID="SqlDataSource2"
                                     runat="server">
                        <EmptyDataTemplate>
                        <i>Select a row from the Orders table.</i>
                        </EmptyDataTemplate>
                    </asp:DetailsView>
                    <asp:SqlDataSource ID="SqlDataSource2"
                                       ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
                                       SelectCommand="SELECT [OrderID], [ProductID], [UnitPrice], [Quantity], [Discount] FROM [Order Details] WHERE ([OrderID] = @OrderID)"
                                       runat="server">
                        <SelectParameters>
                            <asp:Parameter Name="OrderID"
                                           Type="Int32" />
                        </SelectParameters>
                    </asp:SqlDataSource>
                </ContentTemplate>
            </asp:UpdatePanel>
        </div>
    </form>
</body>
</html>

If you put a GridView control inside an UpdatePanel control, setting the GridView control's EnableSortingAndPagingCallbacks property to true is not supported. However, because the UpdatePanel control supports asynchronous postbacks, any postbacks that change the GridView control inside an UpdatePanel control cause the same behavior as sorting and paging callbacks.

Using an UpdatePanel Control in a Template

In the following example, an UpdatePanel control is used in the item template of a GridView control. UpdatePanel controls in each data row are generated automatically. Each row's UpdatePanel control contains a Label control to display the quantity of the item in that row and a Button control to decrease and increase the quantity.


<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    private void ChangeQuantity(object sender, int delta)
    {
        Label quantityLabel = (Label)((Button)sender).FindControl("QuantityLabel");
        int currentQuantity = Int32.Parse(quantityLabel.Text);
        currentQuantity = Math.Max(0, currentQuantity + delta);
        quantityLabel.Text = currentQuantity.ToString(System.Globalization.CultureInfo.InvariantCulture);
    }

    private void OnDecreaseQuantity(object sender, EventArgs e)
    {
        ChangeQuantity(sender, -1);
    }

    private void OnIncreaseQuantity(object sender, EventArgs e)
    {
        ChangeQuantity(sender, 1);
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        StringBuilder sb = new StringBuilder();
        sb.Append("Beverage order:<br/>");
        foreach (GridViewRow row in GridView1.Rows)
        {
            if (row.RowType == DataControlRowType.DataRow)
            {
                Label quantityLabel = (Label)row.FindControl("QuantityLabel");
                int currentQuantity = Int32.Parse(quantityLabel.Text);
                sb.Append(row.Cells[0].Text + " : " + currentQuantity + "<br/>");
            }
        }
        SummaryLabel.Text = sb.ToString();

    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>UpdatePanel Inside GridView Template Example </title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1" 
                               runat="server" />
            <asp:GridView ID="GridView1" 
                          AutoGenerateColumns="False"
                          DataSourceID="SqlDataSource1"
                          runat="server">
                <Columns>
                    <asp:BoundField DataField="ProductName" 
                                    HeaderText="ProductName" />
                    <asp:BoundField DataField="UnitPrice"
                                    HeaderText="UnitPrice" />
                    <asp:TemplateField HeaderText="Quantity">
                        <ItemTemplate>
                            <asp:UpdatePanel ID="QuantityUpdatePanel"
                                             UpdateMode="Conditional"
                                             runat="server" >
                                <ContentTemplate>
                                    <asp:Label ID="QuantityLabel"
                                               Text="0"
                                               runat="server" />
                                    <asp:Button ID="DecreaseQuantity"
                                                Text="-"
                                                OnClick="OnDecreaseQuantity"
                                                runat="server" />
                                    <asp:Button ID="IncreaseQuantity" 
                                                Text="+"
                                                OnClick="OnIncreaseQuantity"
                                                runat="server" />
                                </ContentTemplate>
                            </asp:UpdatePanel>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>            
            <asp:UpdatePanel ID="SummaryUpdatePanel" 
                             UpdateMode="Conditional"
                             runat="server">
                <ContentTemplate>
                    <asp:Button ID="Button1"
                                OnClick="Button1_Click"
                                Text="Get Summary"
                                runat="server" />
                    <br />
                    <asp:Label ID="SummaryLabel"
                               runat="server">
                    </asp:Label>
                </ContentTemplate>
            </asp:UpdatePanel>
            <asp:SqlDataSource ID="SqlDataSource1"
                               ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
                               SelectCommand="SELECT [ProductName], [UnitPrice] FROM 
                               [Alphabetical list of products] WHERE ([CategoryName] 
                               LIKE '%' + @CategoryName + '%')"
                               runat="server">
                <SelectParameters>
                    <asp:Parameter DefaultValue="Beverages"
                                   Name="CategoryName"
                                   Type="String" />
                </SelectParameters>
            </asp:SqlDataSource>
        </div>
    </form>
</body>
</html>


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Private Sub ChangeQuantity(ByVal Sender As Button, ByVal delta As Integer)
        Dim quantityLabel As Label = CType(Sender.FindControl("QuantityLabel"), Label)
        Dim currentQuantity As Integer = Int32.Parse(quantityLabel.Text)
        currentQuantity = Math.Max(0, currentQuantity + delta)
        quantityLabel.Text = currentQuantity.ToString(System.Globalization.CultureInfo.InvariantCulture)
    End Sub

    Private Sub OnDecreaseQuantity(ByVal Sender As Object, ByVal E As EventArgs)
        ChangeQuantity(Sender, -1)
    End Sub

    Private Sub OnIncreaseQuantity(ByVal Sender As Object, ByVal E As EventArgs)
        ChangeQuantity(Sender, 1)
    End Sub

    Protected Sub Button1_Click(ByVal Sender As Object, ByVal E As EventArgs)
    
        Dim sb As New StringBuilder()
        sb.Append("Beverage order:<br/>")
        For Each row As GridViewRow In GridView1.Rows
        
            If row.RowType = DataControlRowType.DataRow Then
                Dim quantityLabel As Label = CType(row.FindControl("QuantityLabel"), Label)
                Dim currentQuantity As Int32 = Int32.Parse(quantityLabel.Text)
                sb.Append(row.Cells(0).Text + " : " & currentQuantity & "<br/>")
            End If
        Next
        SummaryLabel.Text = sb.ToString()

    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>UpdatePanel Inside GridView Template Example </title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:ScriptManager ID="ScriptManager1" 
                               runat="server" />
            <asp:GridView ID="GridView1" 
                          AutoGenerateColumns="False"
                          DataSourceID="SqlDataSource1"
                          runat="server">
                <Columns>
                    <asp:BoundField DataField="ProductName" 
                                    HeaderText="ProductName" />
                    <asp:BoundField DataField="UnitPrice"
                                    HeaderText="UnitPrice" />
                    <asp:TemplateField HeaderText="Quantity">
                        <ItemTemplate>
                            <asp:UpdatePanel ID="QuantityUpdatePanel"
                                             runat="server" >
                                <ContentTemplate>
                                    <asp:Label ID="QuantityLabel"
                                               Text="0"
                                               runat="server" />
                                    <asp:Button ID="DecreaseQuantity"
                                                Text="-"
                                                OnClick="OnDecreaseQuantity"
                                                runat="server" />
                                    <asp:Button ID="IncreaseQuantity" 
                                                Text="+"
                                                OnClick="OnIncreaseQuantity"
                                                runat="server" />
                                </ContentTemplate>
                            </asp:UpdatePanel>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>            
            <asp:UpdatePanel ID="SummaryUpdatePanel" 
                             runat="server">
                <ContentTemplate>
                    <asp:Button ID="Button1"
                                OnClick="Button1_Click"
                                Text="Get Summary"
                                runat="server" />
                    <br />
                    <asp:Label ID="SummaryLabel"
                               runat="server">
                    </asp:Label>
                </ContentTemplate>
            </asp:UpdatePanel>
            <asp:SqlDataSource ID="SqlDataSource1"
                               ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
                               SelectCommand="SELECT [ProductName], [UnitPrice] FROM 
                               [Alphabetical list of products] WHERE ([CategoryName] 
                               LIKE '%' + @CategoryName + '%')"
                               runat="server">
                <SelectParameters>
                    <asp:Parameter DefaultValue="Beverages"
                                   Name="CategoryName"
                                   Type="String" />
                </SelectParameters>
            </asp:SqlDataSource>
        </div>
    </form>
</body>
</html>

Remarks

In this topic:

Introduction
Refreshing UpdatePanel Content
UpdatePanel Usage
Applying Styles
Declarative Syntax

Introduction

UpdatePanel controls are a central part of AJAX functionality in ASP.NET. They are used with the ScriptManager control to enable partial-page rendering. Partial-page rendering reduces the need for synchronous postbacks and complete page updates when only part of the page has to be updated. Partial-page rendering improves the user experience because it reduces the screen flicker that occurs during a full-page postback and improves Web page interactivity.

Refreshing UpdatePanel Content

When partial-page rendering is enabled, a control can perform a postback that updates the whole page or an asynchronous postback that updates the content of one or more UpdatePanel controls. Whether a control causes an asynchronous postback and updates an UpdatePanel control depends on the following:

If the UpdateMode property of the UpdatePanel control is set to Always, the UpdatePanel control's content is updated on every postback that originates from the page. This includes asynchronous postbacks from controls that are inside other UpdatePanel controls and postbacks from controls that are not inside UpdatePanel controls.
If the UpdateMode property is set to Conditional, the UpdatePanel control's content is updated in the following circumstances:
- When you call the Update method of the UpdatePanel control explicitly.
- When the UpdatePanel control is nested inside another UpdatePanel control, and the parent panel is updated.
- When a postback is caused by a control that is defined as a trigger by using the Triggers property of the UpdatePanel control. In this scenario, the control explicitly triggers an update of the panel content. The control can be either inside or outside the UpdatePanel control that the trigger is associated with.
- When the ChildrenAsTriggers property is set to true and a child control of the UpdatePanel control causes a postback. Child controls of nested UpdatePanel controls do not cause an update to the outer UpdatePanel control unless they are explicitly defined as triggers.

The combination of setting the ChildrenAsTriggers property to false and the UpdateMode property to Always is not allowed and will throw an exception.

When the UpdatePanel control performs an asynchronous post, it adds a custom HTTP header. Some proxies remove this custom HTTP header. If this occurs, the server handles the request as a regular postback, which causes a client error. To resolve this issue, insert a custom form field when you perform asynchronous posts. Then check the header or the custom form field in server code.

UpdatePanel Usage

You can use multiple UpdatePanel controls to update multiple page regions independently. When the page that contains one or more UpdatePanel controls is first rendered, all the content of all UpdatePanel controls are rendered and sent to the browser. On subsequent asynchronous postbacks, the content of each UpdatePanel control might not be updated depending on the panel settings and on client or server logic for individual panels.

You can also use UpdatePanel controls for the following:

In user controls.
On master and content pages.
Nested inside other UpdatePanel controls.
Inside templated controls such as the GridView or Repeater controls.

UpdatePanel controls can be added declaratively or programmatically.

You can add an UpdatePanel control programmatically, but you cannot add triggers programmatically. To create trigger-like behavior, you can register a control on the page as an asynchronous postback control. You do this by calling the RegisterAsyncPostBackControl method of the ScriptManager control. You can then create an event handler that runs in response to the asynchronous postback, and in the handler, call the Update method of the UpdatePanel control.

Applying Styles

The UpdatePanel control accepts expando attributes. This lets you set a CSS class for the HTML elements that the controls render. For example, you might create the markup shown in the following example:

<asp:UpdatePanel runat="server" class="myStyle">  
</asp:UpdatePanel>

The markup in the previous example renders HTML similar to the following when the page runs:

<div id="ctl00_MainContent_UpdatePanel1" class="MyStyle">  
</div>

Declarative Syntax

<asp:UpdatePanel  
    ChildrenAsTriggers="True|False"  
    EnableTheming="True|False"  
    EnableViewState="True|False"  
    ID="string"  
    OnDataBinding="DataBinding event handler"  
    OnDisposed="Disposed event handler"  
    OnInit="Init event handler"  
    OnLoad="Load event handler"  
    OnPreRender="PreRender event handler"  
    OnUnload="Unload event handler"  
    RenderMode="Block|Inline"  
    runat="server"  
    SkinID="string"  
    UpdateMode="Always|Conditional"  
    Visible="True|False"  
>  
    <ContentTemplate>  
        <!-- child controls -->  
    </ContentTemplate>  
    <Triggers>  
        <asp:AsyncPostBackTrigger   
            ControlID="string"  
            EventName="string"  
        />  
        <asp:PostBackTrigger   
            ControlID="string"  
        />  
    </Triggers>  
</asp:UpdatePanel>

Constructors

UpdatePanel()

Initializes a new instance of the UpdatePanel class.

Properties

Adapter	Gets the browser-specific adapter for the control. (Inherited from Control)
AppRelativeTemplateSourceDirectory	Gets or sets the application-relative virtual directory of the Page or UserControl object that contains this control. (Inherited from Control)
Attributes	Gets the cascading style sheet (CSS) attributes collection of the UpdatePanel control.
BindingContainer	Gets the control that contains this control's data binding. (Inherited from Control)
ChildControlsCreated	Gets a value that indicates whether the server control's child controls have been created. (Inherited from Control)
ChildrenAsTriggers	Gets or sets a value that indicates whether postbacks from immediate child controls of an UpdatePanel control update the panel's content.
ClientID	Gets the control ID for HTML markup that is generated by ASP.NET. (Inherited from Control)
ClientIDMode	Gets or sets the algorithm that is used to generate the value of the ClientID property. (Inherited from Control)
ClientIDSeparator	Gets a character value representing the separator character used in the ClientID property. (Inherited from Control)
ContentTemplate	Gets or sets the template that defines the content of the UpdatePanel control.
ContentTemplateContainer	Gets a control object to which you can programmatically add child controls.
Context	Gets the HttpContext object associated with the server control for the current Web request. (Inherited from Control)
Controls	Gets the ControlCollection object that contains the child controls for the UpdatePanel control.
DataItemContainer	Gets a reference to the naming container if the naming container implements IDataItemContainer. (Inherited from Control)
DataKeysContainer	Gets a reference to the naming container if the naming container implements IDataKeysControl. (Inherited from Control)
DesignMode	Gets a value indicating whether a control is being used on a design surface. (Inherited from Control)
EnableTheming	Gets or sets a value indicating whether themes apply to this control. (Inherited from Control)
EnableViewState	Gets or sets a value indicating whether the server control persists its view state, and the view state of any child controls it contains, to the requesting client. (Inherited from Control)
Events	Gets a list of event handler delegates for the control. This property is read-only. (Inherited from Control)
HasChildViewState	Gets a value indicating whether the current server control's child controls have any saved view-state settings. (Inherited from Control)
ID	Gets or sets the programmatic identifier assigned to the server control. (Inherited from Control)
IdSeparator	Gets the character used to separate control identifiers. (Inherited from Control)
IsChildControlStateCleared	Gets a value indicating whether controls contained within this control have control state. (Inherited from Control)
IsInPartialRendering	Gets a value that indicates whether the UpdatePanel control is being updated as a result of an asynchronous postback.
IsTrackingViewState	Gets a value that indicates whether the server control is saving changes to its view state. (Inherited from Control)
IsViewStateEnabled	Gets a value indicating whether view state is enabled for this control. (Inherited from Control)
LoadViewStateByID	Gets a value indicating whether the control participates in loading its view state by ID instead of index. (Inherited from Control)
NamingContainer	Gets a reference to the server control's naming container, which creates a unique namespace for differentiating between server controls with the same ID property value. (Inherited from Control)
Page	Gets a reference to the Page instance that contains the server control. (Inherited from Control)
Parent	Gets a reference to the server control's parent control in the page control hierarchy. (Inherited from Control)
RenderingCompatibility	Gets a value that specifies the ASP.NET version that rendered HTML will be compatible with. (Inherited from Control)
RenderMode	Gets or sets a value that indicates whether an UpdatePanel control's content is enclosed in an HTML `<div>` or `<span>` element.
RequiresUpdate	Gets a value that indicates whether the content of the UpdatePanel control will be updated.
Site	Gets information about the container that hosts the current control when rendered on a design surface. (Inherited from Control)
SkinID	Gets or sets the skin to apply to the control. (Inherited from Control)
TemplateControl	Gets or sets a reference to the template that contains this control. (Inherited from Control)
TemplateSourceDirectory	Gets the virtual directory of the Page or UserControl that contains the current server control. (Inherited from Control)
Triggers	Gets an UpdatePanelTriggerCollection object that contains AsyncPostBackTrigger and PostBackTrigger objects that were registered declaratively for the UpdatePanel control.
UniqueID	Gets the unique, hierarchically qualified identifier for the server control. (Inherited from Control)
UpdateMode	Gets or sets a value that indicates when an UpdatePanel control's content is updated.
ValidateRequestMode	Gets or sets a value that indicates whether the control checks client input from the browser for potentially dangerous values. (Inherited from Control)
ViewState	Gets a dictionary of state information that allows you to save and restore the view state of a server control across multiple requests for the same page. (Inherited from Control)
ViewStateIgnoresCase	Gets a value that indicates whether the StateBag object is case-insensitive. (Inherited from Control)
ViewStateMode	Gets or sets the view-state mode of this control. (Inherited from Control)
Visible	Gets or sets a value that indicates whether a server control is rendered as UI on the page. (Inherited from Control)

Methods

AddedControl(Control, Int32)	Called after a child control is added to the Controls collection of the Control object. (Inherited from Control)
AddParsedSubObject(Object)	Notifies the server control that an element, either XML or HTML, was parsed, and adds the element to the server control's ControlCollection object. (Inherited from Control)
ApplyStyleSheetSkin(Page)	Applies the style properties defined in the page style sheet to the control. (Inherited from Control)
BeginRenderTracing(TextWriter, Object)	Begins design-time tracing of rendering data. (Inherited from Control)
BuildProfileTree(String, Boolean)	Gathers information about the server control and delivers it to the Trace property to be displayed when tracing is enabled for the page. (Inherited from Control)
ClearCachedClientID()	Sets the cached ClientID value to `null`. (Inherited from Control)
ClearChildControlState()	Deletes the control-state information for the server control's child controls. (Inherited from Control)
ClearChildState()	Deletes the view-state and control-state information for all the server control's child controls. (Inherited from Control)
ClearChildViewState()	Deletes the view-state information for all the server control's child controls. (Inherited from Control)
ClearEffectiveClientIDMode()	Sets the ClientIDMode property of the current control instance and of any child controls to Inherit. (Inherited from Control)
CreateChildControls()	Called by the ASP.NET page framework to notify server controls that use composition-based implementation to create any child controls they contain in preparation for posting back or rendering. (Inherited from Control)
CreateContentTemplateContainer()	Creates a Control object that acts as a container for child controls that define the UpdatePanel control's content.
CreateControlCollection()	Returns the collection of all controls contained in the UpdatePanel control.
DataBind()	Binds a data source to the invoked server control and all its child controls. (Inherited from Control)
DataBind(Boolean)	Binds a data source to the invoked server control and all its child controls with an option to raise the DataBinding event. (Inherited from Control)
DataBindChildren()	Binds a data source to the server control's child controls. (Inherited from Control)
Dispose()	Enables a server control to perform final clean up before it is released from memory. (Inherited from Control)
EndRenderTracing(TextWriter, Object)	Ends design-time tracing of rendering data. (Inherited from Control)
EnsureChildControls()	Determines whether the server control contains child controls. If it does not, it creates child controls. (Inherited from Control)
EnsureID()	Creates an identifier for controls that do not have an identifier assigned. (Inherited from Control)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
FindControl(String)	Searches the current naming container for a server control with the specified `id` parameter. (Inherited from Control)
FindControl(String, Int32)	Searches the current naming container for a server control with the specified `id` and an integer, specified in the `pathOffset` parameter, which aids in the search. You should not override this version of the FindControl method. (Inherited from Control)
Focus()	Sets input focus to a control. (Inherited from Control)
GetDesignModeState()	Gets design-time data for a control. (Inherited from Control)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetRouteUrl(Object)	Gets the URL that corresponds to a set of route parameters. (Inherited from Control)
GetRouteUrl(RouteValueDictionary)	Gets the URL that corresponds to a set of route parameters. (Inherited from Control)
GetRouteUrl(String, Object)	Gets the URL that corresponds to a set of route parameters and a route name. (Inherited from Control)
GetRouteUrl(String, RouteValueDictionary)	Gets the URL that corresponds to a set of route parameters and a route name. (Inherited from Control)
GetType()	Gets the Type of the current instance. (Inherited from Object)
GetUniqueIDRelativeTo(Control)	Returns the prefixed portion of the UniqueID property of the specified control. (Inherited from Control)
HasControls()	Determines if the server control contains any child controls. (Inherited from Control)
HasEvents()	Returns a value indicating whether events are registered for the control or any child controls. (Inherited from Control)
Initialize()	Initializes the UpdatePanel control trigger collection if partial-page rendering is enabled.
IsLiteralContent()	Determines if the server control holds only literal content. (Inherited from Control)
LoadControlState(Object)	Restores control-state information from a previous page request that was saved by the SaveControlState() method. (Inherited from Control)
LoadViewState(Object)	Restores view-state information from a previous page request that was saved by the SaveViewState() method. (Inherited from Control)
MapPathSecure(String)	Retrieves the physical path that a virtual path, either absolute or relative, maps to. (Inherited from Control)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
OnBubbleEvent(Object, EventArgs)	Determines whether the event for the server control is passed up the page's UI server control hierarchy. (Inherited from Control)
OnDataBinding(EventArgs)	Raises the DataBinding event. (Inherited from Control)
OnInit(EventArgs)	Raises the Init event.
OnLoad(EventArgs)	Raises the Load event for the UpdatePanel control and invokes the Initialize() method when partial-page rendering is not enabled.
OnPreRender(EventArgs)	Raises the PreRender event.
OnUnload(EventArgs)	Raises the base Unload event.
OpenFile(String)	Gets a Stream used to read a file. (Inherited from Control)
RaiseBubbleEvent(Object, EventArgs)	Assigns any sources of the event and its information to the control's parent. (Inherited from Control)
RemovedControl(Control)	Called after a child control is removed from the Controls collection of the Control object. (Inherited from Control)
Render(HtmlTextWriter)	Raises the Render(HtmlTextWriter) event.
RenderChildren(HtmlTextWriter)	Raises the RenderChildren(HtmlTextWriter) event.
RenderControl(HtmlTextWriter)	Outputs server control content to a provided HtmlTextWriter object and stores tracing information about the control if tracing is enabled. (Inherited from Control)
RenderControl(HtmlTextWriter, ControlAdapter)	Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object. (Inherited from Control)
ResolveAdapter()	Gets the control adapter responsible for rendering the specified control. (Inherited from Control)
ResolveClientUrl(String)	Gets a URL that can be used by the browser. (Inherited from Control)
ResolveUrl(String)	Converts a URL into one that is usable on the requesting client. (Inherited from Control)
SaveControlState()	Saves any server control state changes that have occurred since the time the page was posted back to the server. (Inherited from Control)
SaveViewState()	Saves any server control view-state changes that have occurred since the time the page was posted back to the server. (Inherited from Control)
SetDesignModeState(IDictionary)	Sets design-time data for a control. (Inherited from Control)
SetRenderMethodDelegate(RenderMethod)	Assigns an event handler delegate to render the server control and its content into its parent control. (Inherited from Control)
SetTraceData(Object, Object)	Sets trace data for design-time tracing of rendering data, using the trace data key and the trace data value. (Inherited from Control)
SetTraceData(Object, Object, Object)	Sets trace data for design-time tracing of rendering data, using the traced object, the trace data key, and the trace data value. (Inherited from Control)
ToString()	Returns a string that represents the current object. (Inherited from Object)
TrackViewState()	Causes tracking of view-state changes to the server control so they can be stored in the server control's StateBag object. This object is accessible through the ViewState property. (Inherited from Control)
Update()	Causes an update of the content of an UpdatePanel control.

Events

DataBinding	Occurs when the server control binds to a data source. (Inherited from Control)
Disposed	Occurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.NET page is requested. (Inherited from Control)
Init	Occurs when the server control is initialized, which is the first step in its lifecycle. (Inherited from Control)
Load	Occurs when the server control is loaded into the Page object. (Inherited from Control)
PreRender	Occurs after the Control object is loaded but prior to rendering. (Inherited from Control)
Unload	Occurs when the server control is unloaded from memory. (Inherited from Control)

Explicit Interface Implementations

IAttributeAccessor.GetAttribute(String)	Returns an attribute of a Web control by using a specified name.
IAttributeAccessor.SetAttribute(String, String)	Sets the value of the specified control attribute.
IControlBuilderAccessor.ControlBuilder	For a description of this member, see ControlBuilder. (Inherited from Control)
IControlDesignerAccessor.GetDesignModeState()	For a description of this member, see GetDesignModeState(). (Inherited from Control)
IControlDesignerAccessor.SetDesignModeState(IDictionary)	For a description of this member, see SetDesignModeState(IDictionary). (Inherited from Control)
IControlDesignerAccessor.SetOwnerControl(Control)	For a description of this member, see SetOwnerControl(Control). (Inherited from Control)
IControlDesignerAccessor.UserData	For a description of this member, see UserData. (Inherited from Control)
IDataBindingsAccessor.DataBindings	For a description of this member, see DataBindings. (Inherited from Control)
IDataBindingsAccessor.HasDataBindings	For a description of this member, see HasDataBindings. (Inherited from Control)
IExpressionsAccessor.Expressions	For a description of this member, see Expressions. (Inherited from Control)
IExpressionsAccessor.HasExpressions	For a description of this member, see HasExpressions. (Inherited from Control)
IParserAccessor.AddParsedSubObject(Object)	For a description of this member, see AddParsedSubObject(Object). (Inherited from Control)

Extension Methods

FindDataSourceControl(Control)	Returns the data source that is associated with the data control for the specified control.
FindFieldTemplate(Control, String)	Returns the field template for the specified column in the specified control's naming container.
FindMetaTable(Control)	Returns the metatable object for the containing data control.

Applies to

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