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 1 private void ss()
 2         {
 3             //this.Hide();
 4             IntPtr dc1=CreateDC("DISPLAY",null,null,(IntPtr) null)   ;   
 5             //创建显示器的DC   
 6             Graphics g1=Graphics.FromHdc(dc1)   ;   
 7             //由一个指定设备的句柄创建一个新的Graphics对象   
 8             Bitmap MyImage=new Bitmap(Screen.PrimaryScreen.Bounds.Width,Screen.PrimaryScreen.Bounds.Height,g1); 
 9             //根据屏幕大小创建一个与之相同大小的Bitmap对象   
10             Graphics   g2   =   Graphics.FromImage   (   MyImage   )   ;   
11             //获得屏幕的句柄   
12             IntPtr dc3 =g1.GetHdc();   
13             //获得位图的句柄   
14             IntPtr dc2 =g2.GetHdc();   
15             //把当前屏幕捕获到位图对象中   
16             BitBlt(dc2,0,0,Screen.PrimaryScreen.Bounds.Width ,Screen.PrimaryScreen.Bounds.Height,dc3,0,0,13369376);
17             //把当前屏幕拷贝到图中   
18             g1.ReleaseHdc(dc3);   
19             //释放屏幕句柄   
20             g2.ReleaseHdc(dc2);
21             textBox3.Text=MyImage.GetPixel(Convert.ToInt16(textBox1.Text),Convert.ToInt16(textBox2.Text)).Name.ToString();
22             
23 
24             //textBox3.Text=MyImage.GetPixel(812,16).Name.ToString();
25             //this.Show();
26         }

转自http://blog.csdn.net/srnpr/archive/2007/06/16/1654559.aspx