在C# winform窗体中如何实现 无缝走马灯 效果啊 急用！

在C# winform窗体中怎么实现 无缝走马灯 效果啊 急用！！
在C# winform窗体中怎么实现 无缝走马灯 效果啊
请大家帮帮忙！ 谢谢！

[解决办法]
这是我在另外一个帖子发的代码，原理大致相同，不妨试试：

C# code

// RainDrops.cs// compile with:   csc /t:winexe RainDrops.csusing System;using System.Drawing;using System.Windows.Forms;public class Form1 : Form{    Bitmap rainDrops;    Timer timer = new Timer();    int top = 0;    public Form1()    {        this.Size = new Size(300, 300);        Rectangle rect = this.ClientRectangle;        rainDrops = new Bitmap(rect.Width, rect.Height * 2);        using (Graphics g = Graphics.FromImage(rainDrops))        {            g.Clear(Color.LightBlue);            Random random = new Random();            for (int i = 0; i < 1000; i++)            {                int x = random.Next() % rect.Width;                int y = random.Next() % rect.Height;                int dot = random.Next() % 5;                g.FillEllipse(Brushes.White, x, y, dot, dot);                g.FillEllipse(Brushes.White, x, y+rect.Height, dot, dot);            }        }        timer.Interval = 200;        timer.Enabled = true;        timer.Tick += delegate { Invalidate(); };    }    protected override void OnPaint(PaintEventArgs e)    {        int height = this.ClientRectangle.Height;        top += 10;        if (top > height) top = 0;        e.Graphics.DrawImageUnscaled(rainDrops, 0, top - height);    }    protected override void OnPaintBackground(PaintEventArgs e)    {    }    static void Main()    {        Application.Run(new Form1());    }}