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TextBoxBase.SelectionStart Property

Gets or sets the starting point of text selected in the text box.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

[<BrowsableAttribute(false)>]
member SelectionStart : int with get, set

Property Value

Type: System.Int32
The starting position of text selected in the text box.

ExceptionCondition
ArgumentOutOfRangeException

The assigned value is less than zero.

If no text is selected in the control, this property indicates the insertion point, or caret, for new text. If you set this property to a location beyond the length of the text in the control, the selection start position will be placed after the last character. When text is selected in the text box control, changing this property might decrease the value of the SelectionLength property. If the remaining text in the control after the position indicated by the SelectionStart property is less than the value of the SelectionLength property, the value of the SelectionLength property is automatically decreased. The value of the SelectionStart property never causes an increase in the SelectionLength property.

You can programmatically move the selection within the text box by setting the SelectionStart and the SelectionLength properties.

You can programmatically move the caret within the text box by setting the SelectionStart to the position within the text box where you want the caret to move to and set the SelectionLength property to a value of zero (0).

The TextBox must have focus in order for the selection or the caret to be moved. You can set the SelectionStart property of a TextBox that is ReadOnly by giving it the Focus first.

Example 1

The following code example uses TextBox, a derived class. It provides Click event handlers for MenuItem objects that perform Cut, Copy, Paste, and Undo operations. This example requires that a TextBox control named textBox1 has been created.

No code example is currently available or this language may not be supported.

Example 2

The following example sets the SelectionStart property of a TextBox that is ReadOnly by giving it the Focus first.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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