A string representing the property used to set the control's value. Can be a null reference (Nothing in Visual Basic) if Control is a null reference (Nothing in Visual Basic).
Requirements
Target Platforms: Windows 7, 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