When overridden in a derived class, gets or sets the zero-based index of the currently selected item.
abstract SelectedIndex : int with get, set
System .Int32 A zero-based index of the currently selected item. A value of negative one (-1) is returned if no item is selected. .NET Framework
Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see
.NET Framework System Requirements.