ClearCanvas.Desktop.View.WinForms.BindingTreeView.OnDragEnter C# (CSharp) Method

        protected override void OnDragEnter(DragEventArgs e)
        {
            // clear any record of a previous drop target node
            _dropTargetNode = null;
            _dropEffect = DragDropEffects.None;
			_dropPosition = DragDropPosition.Default;

            base.OnDragEnter(e);
        }