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TextBox.SelectionStart Property

Gets or sets a character index for the beginning of the current selection.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public int SelectionStart { get; set; }
<object SelectionStart="int" .../>

Property Value

Type: System.Int32
The character index for the beginning of the current selection.


SelectionStart is set to a negative value.

In cases where the specified selection length would cause the selection to end between a carriage return and a new-line character, the selection length is automatically increased by 1 so that the resulting selection spans the entire end-of-line marker.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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