TextBoxBase.AutoSize Property

Definition

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Source:

TextBoxBase.cs

Gets or sets a value indicating whether the height of the control automatically adjusts when the font assigned to the control is changed.

public:
 virtual property bool AutoSize { bool get(); void set(bool value); };

[System.ComponentModel.Browsable(false)]
public override bool AutoSize { get; set; }

[<System.ComponentModel.Browsable(false)>]
member this.AutoSize : bool with get, set

Public Overrides Property AutoSize As Boolean

Property Value

Boolean

true if the height of the control automatically adjusts when the font is changed; otherwise, false. The default is true.

Attributes

BrowsableAttribute

Examples

This example assumes that you have a form with two text boxes, two buttons, and click events for each of the buttons. The example demonstrates the AutoSize property by setting it to true for one text box and false for the other. When you click one button the text boxes are filled with a smaller text, and when you click the other button the text boxes are filled with larger text. The text box that has AutoSize set to true expands in height to accommodate the larger text. The width does not change.

private void button1_Click(object sender, EventArgs e)
{
    this.textBox1.AutoSize = true;
    this.textBox1.Text = "Hello world!";
    this.textBox1.Font = new System.Drawing.Font("Arial", 10, FontStyle.Regular);

    this.textBox2.AutoSize = false;
    this.textBox2.Text = "Hello world!";
    this.textBox2.Font = new System.Drawing.Font("Arial", 10, FontStyle.Regular);
}

private void button2_Click(object sender, EventArgs e)
{
    this.textBox1.AutoSize = true;
    this.textBox1.Text = "Goodbye world!";
    this.textBox1.Font = new System.Drawing.Font("ArialBlack", 14, FontStyle.Regular);

    this.textBox2.AutoSize = false;
    this.textBox2.Text = "Goodbye world!";
    this.textBox2.Font = new System.Drawing.Font("ArialBlack", 14, FontStyle.Regular);
}

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

    Me.TextBox1.AutoSize = True
    Me.TextBox1.Text = "Hello world!"
    Me.TextBox1.Font = New System.Drawing.Font("Arial", 10, FontStyle.Regular)

    Me.TextBox2.AutoSize = False
    Me.TextBox2.Text = "Hello world!"
    Me.TextBox2.Font = New System.Drawing.Font("Arial", 10, FontStyle.Regular)
End Sub


Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

    Me.TextBox1.AutoSize = True
        Me.TextBox1.Text = "Goodbye world!"
    Me.TextBox1.Font = New System.Drawing.Font("ArialBlack", 14, FontStyle.Regular)

    Me.TextBox2.AutoSize = False
        Me.TextBox2.Text = "Goodbye world!"
    Me.TextBox2.Font = New System.Drawing.Font("ArialBlack", 14, FontStyle.Regular)
End Sub

Remarks

When you set the AutoSize property to true for a TextBox, when the Font changes, the TextBox expands or contracts the Height to accommodate the larger or smaller text. The Width of the TextBox does not change.

If you want to change the size of the control as the user enters text, you can use a RichTextBox control and use its ContentsResized event to change its size.