大哥大姐们，帮我实现两个TreeView控件上节点之间的画线，谢谢了！

点击左边一棵树的节点，再点右边一棵树的节点后，就实现两节点之间的画线 --------------------编程问答-------------------- 什么意思？
用GDI画条线行不 --------------------编程问答-------------------- 可以就是用GDI+画线。还有不明白的加我QQ再说好吧 --------------------编程问答-------------------- QQ125548996，比较急，知道的帮帮忙，小弟谢谢各位了 --------------------编程问答-------------------- 学习 --------------------编程问答-------------------- using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace TreeViewDemo2
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
            treeView1.ExpandAll();
            treeView2.ExpandAll();
        }

        private List<Line> lines = new List<Line>();
        private Line myLine = null;

        protected override void OnPaint( PaintEventArgs e )
        {
            base.OnPaint( e );

            Graphics grfx = e.Graphics;
            grfx.SmoothingMode = SmoothingMode.AntiAlias;

            Pen myPen = new Pen( Color.Red, 1 );

            foreach ( Line line in lines )
            {
                grfx.DrawLine( myPen, line.startPoint, line.endPoint );
            }
        }

        private void treeView2_AfterSelect( object sender, TreeViewEventArgs e )
        {
            TreeNode node = treeView2.SelectedNode;

            if ( node != null )
            {
                // 判断直线对象是否存在
                if ( myLine == null )
                {
                    myLine = new Line();
                    lines.Add( myLine );
                }

                myLine.endPoint.Y = node.Bounds.Bottom -
                                        node.Bounds.Height / 2;
                myLine.endPoint.X = this.Width - treeView2.Width;

                // 判断直线终点是否存在,存在则画线
                if ( myLine.startPoint != Point.Empty )
                {
                    Invalidate();
                    myLine = null;
                }

            }
        }

        private void treeView1_AfterSelect( object sender, TreeViewEventArgs e )
        {
            TreeNode node = treeView1.SelectedNode;

            if ( node != null )
            {
                // 判断直线对象是否存在
                if ( myLine == null )
                {
                    myLine = new Line();
                    lines.Add( myLine );
                }

                myLine.startPoint.Y = node.Bounds.Bottom -
                                        node.Bounds.Height / 2;
                myLine.startPoint.X = treeView1.Width;

                // 判断直线终点是否存在,存在则画线
                if ( myLine.endPoint != Point.Empty )
                {
                    Invalidate();
                    myLine = null;
                }

            }
        }
    }

    //反向展开树
    public class MyTreeView : TreeView
    {
        public MyTreeView()
        {
        }

        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cp = base.CreateParams;

                cp.ExStyle |=  0x400000 | 0x4000;          //WS_EX_LAYOUTRIL = 0x400000, WS_EX_LEFT = 0x4000.

                return cp;
            }
        }
    }

    class Line
    {
        public Point startPoint;
        public Point endPoint;

        public Line()
        {
        }

        public Line( Point pt )
        {
            startPoint = pt;
            endPoint = pt;
        }
    }
}

注意: 在Form1.Designer.cs中的最下面修改一下将System.Windows.Forms.TreeView treeView2那行注释,输入private MytreeView treeView2以生成反向展开树.

#endregion

        private System.Windows.Forms.TreeView treeView1;
        private MyTreeView treeView2;
        //private System.Windows.Forms.TreeView treeView2;

两个树控件均从工具箱中拖入窗体.此程序只能初步实现节点连线,仅提供参考.因为小弟也只是才学了一个多月的新手,希望有高人能给出更好的程序.

补充：.NET技术 ,  C#