树控件内容拖拽到文本框

一个简单的例子，供大家参考。

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private TreeNode NodeMouseOn = null;

        private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
        {
            ArrayList al = new ArrayList();
            this.NodeMouseOn = (TreeNode)e.Item;
            al.Add(NodeMouseOn);
            DoDragDrop(al, DragDropEffects.Copy);

            /////////////////////////
            //TreeNode tnNew = null;
            //string tnName;
            //tnName = dr["ItemClassName"].ToString();
            //tnNew = tnParent.Nodes.Add(tnName);
            //tnNew.ta.Tag = dr["ItemClassID"].ToString();
        }

        private void textBox1_DragDrop(object sender, DragEventArgs e)
        {
            ArrayList al = new ArrayList();
            ArrayList s = (ArrayList)e.Data.GetData(al.GetType());
            this.textBox1.Text += ((TreeNode)s[0]).Text;
        }

        private void textBox1_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.Copy; 
        }

        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

    }

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