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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.

ExceptionCondition
ArgumentOutOfRangeException

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
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