Gets or sets the index specifying the currently selected item.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The specified index is less than or equal to -2.
The specified index is greater than or equal to the number of items in the combo box.
This property indicates the zero-based index of the currently selected item in the combo box list. Setting a new index raises the SelectedIndexChanged event.
To deselect the currently selected item, set the to -1. You cannot set the of a ComboBox item to -1 if the item is a data-bound item.
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.