July 28, 2014
Gets or sets the number of characters in the current selection in the text box.
Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.
Getting this property returns the number of characters in the current selection. Setting this property adjusts the length of the current selection to the specified value, keeping the beginning of the selection fixed.
If the specified selection length is longer than the amount of text, the selection length automatically adjusts so that the resulting selection is never more than the amount of text.
A SelectionChanged event is raised when a valid is set.