WinForm screenshot save C code

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The code is as follows ：

 1 using System.Runtime.InteropServices;
 2 using System.Drawing.Imaging;
 3 
 4  
 5 
 6     [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
 7     private static extern bool BitBlt(
 8 
 9                     IntPtr hdcDest,   //    The goal is    DC The handle of    
10                     int nXDest,
11                     int nYDest,
12                     int nWidth,
13                     int nHeight,
14                     IntPtr hdcSrc,     //    Source DC The handle of    
15                     int nXSrc,
16                     int nYSrc,
17                     System.Int32 dwRop     //    Processing value of grating    
18                       ); 
19 
20  
21 
22   private   void   button1_Click(object   sender,   System.EventArgs   e)   
23   {   
24   // Get the current screen size    http://www.cnblogs.com/roucheng/
25   Rectangle   rect   =   new   Rectangle   (   )   ;   
26   rect   =   Screen.GetWorkingArea   (   this   )   ;   
27   // Create an image based on the current screen    
28   Graphics   g1   =   this.CreateGraphics   (   )   ;   
29   // Create a bitmap based on screen size      
30   Image   MyImage   =   new   Bitmap   (   rect.Width   ,   rect.Height   ,   g1   )   ;   
31   Graphics   g2   =   Graphics.FromImage   (   MyImage   )   ;   
32   // Get the screen DC   
33   IntPtr   dc1   =   g1.GetHdc   (   )   ;   
34   // obtain Bitmap Of DC     
35   IntPtr   dc2   =   g2.GetHdc   (   )   ;   
36   // Call this API function , Realize screen capture    
37   BitBlt   (   dc2   ,   0   ,   0   ,   rect.Width   ,   rect.Height   ,   dc1   ,   0   ,   0   ,   13369376   )   ;   
38   // Release the screen DC   
39   g1.ReleaseHdc   (   dc1   )   ;   
40   // release Bitmap Of DC     
41   g2.ReleaseHdc   (   dc2   )   ;   
42   // With JPG File format to save    
43   MyImage.Save   (   @"c:/Capture.jpg"   ,   ImageFormat.Jpeg   );   
44   MessageBox.Show   (   " The current screen has been saved as C Discoid capture.jpg file ！"   )   ;   
45   }

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