SelectedIndex property. DropDownList does not allow no selection.
[Visual Basic] Overridable Public Property SelectedIndex As Integer [C#] public int SelectedIndex {override get; override set;} [C++] public: __property virtual int get_SelectedIndex(); public: __property virtual void set_SelectedIndex(int); [JScript] public function get SelectedIndex() : int; public function set SelectedIndex(int);
DropDownList Class | DropDownList Members | System.Web.UI.WebControls Namespace