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.NET and JavaScript UI Controls
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SelectedText Property (XamTextEditor)

Gets or sets the selected text.
Syntax
'Declaration
 
Public Property SelectedText As String
public string SelectedText {get; set;}
Remarks

SelectedText property returns the currently selected text if any. If nothing is selected then returns empty string.

Setting this property replaces the current selected text with the set value. If nothing is selected and the property is set, the set value is inserted at the location of the caret. Note that setting this property will modify the contents of the control.

Example
The following code demonstrates selection related properties of the XamTextEditor.

Private Sub Button1_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
        ' Make sure the editor is in edit mode. The following operations
        ' are only valid during edit mode. You can set IsAlwaysInEditMode
        ' to True so this step is not necessary as the editor will always
        ' be in edit mode.
        Me.textEditor1.StartEditMode()

        Me.textEditor1.Value = "Test"

        ' Select 3 characters starting from character position 1.
        Me.textEditor1.SelectionStart = 1
        Me.textEditor1.SelectionLength = 3

        ' This will print out the selected text which is "est".
        Dim selectedText As String = Me.textEditor1.SelectedText
        Debug.WriteLine("SelectedText = " & selectedText)

        ' Setting the SelectedText will delete the selected text
        ' and in its place insert the specified text. If nothing
        ' is currently selected then the specified text will be 
        ' inserted at the caret location.
        Me.textEditor1.SelectedText = "EST"

        ' SelectAll will select all of the text.
        Me.textEditor1.SelectAll()

        ' The following two lines perform the same operation as SelectAll.
        ' TextLength property returns the length of text in the editor.
        Me.textEditor1.SelectionStart = 0
        Me.textEditor1.SelectionLength = Me.textEditor1.TextLength
    End Sub
public void button1_Click( object sender, RoutedEventArgs e )
{
	// Make sure the editor is in edit mode. The following operations
	// are only valid during edit mode. You can set IsAlwaysInEditMode
	// to True so this step is not necessary as the editor will always
	// be in edit mode.
	this.textEditor1.StartEditMode( );

	this.textEditor1.Value = "Test";

	// Select 3 characters starting from character position 1.
	this.textEditor1.SelectionStart = 1;
	this.textEditor1.SelectionLength = 3;

	// This will print out the selected text which is "est".
	string selectedText = this.textEditor1.SelectedText;
	Debug.WriteLine( "SelectedText = " + selectedText );

	// Setting the SelectedText will delete the selected text
	// and in its place insert the specified text. If nothing
	// is currently selected then the specified text will be 
	// inserted at the caret location.
	this.textEditor1.SelectedText = "EST";

	// SelectAll will select all of the text.
	this.textEditor1.SelectAll( );

	// The following two lines perform the same operation as SelectAll.
	// TextLength property returns the length of text in the editor.
	this.textEditor1.SelectionStart = 0;
	this.textEditor1.SelectionLength = this.textEditor1.TextLength;
}
<igEditors:XamTextEditor x:Name="textEditor1"  />
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also