Adds an event handler for the "beforeSelect" event notification. The onBeforeSelect event is fired when the user attempts to select a node. The event can be cancelled by the handler, in which case the node won't be selected.
[Visual Basic] Public Sub AddOnBeforeSelect( _ ByVal handler As TreeViewCancelEventHandler _ ) [C#] public void AddOnBeforeSelect( TreeViewCancelEventHandler handler ); [C++] public: void AddOnBeforeSelect( TreeViewCancelEventHandler* handler ); [JScript] public function AddOnBeforeSelect( handler : TreeViewCancelEventHandler );
TreeView Class | TreeView Members | System.WinForms Namespace