AdvancedPageDragAndDrop.PageDragTreeView.DragTargetTreeViewTransfer.IsMatch C# (CSharp) Méthode

            public override bool IsMatch(Point screenPt, PageDragEndData dragEndData)
            {
                // Cannot drag back to ourself
                if ((dragEndData.Source != null) &&
                    (dragEndData.Source is PageDragTreeView) &&
                    (dragEndData.Source == _treeView))
                    return false;
                else
                    return base.IsMatch(screenPt, dragEndData);
            }