1         private void OnTreeView1ItemDrag(object sender, ItemDragEventArgs e)
 2         {
 3             IDataObject data = new DataObject();
 4 
 5             data.SetData("Test", e.Item);
 6 
 7             //开始拖放操作
 8             this.DoDragDrop(data, DragDropEffects.Copy);
 9         }
10 
11         private void OnPanel1DragEnter(object sender, DragEventArgs e)
12         {
13             if (e.Data.GetDataPresent("Test"))
14                 e.Effect = DragDropEffects.Copy;
15             else
16                 e.Effect = DragDropEffects.None;
17         }
18 
19         private void OnPanel1DragDrop(object sender, DragEventArgs e)
20         {
21             object item = e.Data.GetData("Test");
22 
23             TreeNode node = (TreeNode)item;
24             Label label = new Label();
25 
26             this.panel1.Controls.Add(label);
27 
28             label.AutoSize = true;
29             label.Location = new System.Drawing.Point(e.X - this.treeView1.Width - this.panel1.Location.X, e.Y - this.panel1.Location.Y);
30             label.Name = node.Name;
31             label.Size = new System.Drawing.Size(41, 12);
32             label.TabIndex = 0;
33             label.Text = node.Name;
34             
35         }