The index of the currently selected item in the list, if there is one. If the value is-1, there is currently no selection. If the value is 0 or greater, than the value is the index of the currently selected item. If the MultiSelect property on the ListBox is true, then a non-zero value for this property is the index of the first 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);