Use the GetControlValidationValue method to get the value associated with the specified input control, regardless of the control type. For example, you can use this method to get the value in a TextBox control, as well as the value of the selected item from a ListBox control. If the specified control cannot be found, null is returned.
This method is used primarily by control developers.
Windows Phone 8.1, Windows Phone 8, 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)