Screen Capture on Multiple Monitors

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Screen_Grab
{
public partial class capture_class
{
       #region Exported WIN APIs
       [DllImport("GDI32.dll")]
public static extern bool BitBlt(int hdcDest,int nXDest,int nYDest,int nWidth,int nHeight,int hdcSrc,int nXSrc,int nYSrc,int dwRop);

[DllImport("GDI32.dll")]
public static extern int CreateCompatibleBitmap(int hdc,int nWidth, int nHeight);[DllImport("GDI32.dll")]
public static extern int CreateCompatibleDC(int hdc);

[DllImport("GDI32.dll")]
public static extern bool DeleteDC(int hdc);

[DllImport("GDI32.dll")]
public static extern bool DeleteObject(int hObject);


[DllImport("gdi32.dll")]
static extern int CreateDC(string lpszDriver, string lpszDevice, string lpszOutput, IntPtr lpInitData);

[DllImport("GDI32.dll")]
public static extern int GetDeviceCaps(int hdc,int nIndex);

[DllImport("GDI32.dll")]
public static extern int SelectObject(int hdc,int hgdiobj);

[DllImport("User32.dll")]
public static extern int GetDesktopWindow();

[DllImport("User32.dll")]
public static extern int GetWindowDC(int hWnd);

[DllImport("User32.dll")]
public static extern int ReleaseDC(int hWnd,int hDC);
       #endregion

//function to capture screen section       
public static void CaptureScreentoClipboard(int x,int y, int wid, int hei) 
{
   //create DC for the entire virtual screen
   int hdcSrc = CreateDC("DISPLAY", null, null, IntPtr.Zero);  
   int hdcDest = CreateCompatibleDC(hdcSrc);
   int hBitmap = CreateCompatibleBitmap(hdcSrc, wid, hei); 
   SelectObject(hdcDest, hBitmap);
   
// set the destination area White - a little complicated
     Bitmap bmp = new Bitmap(wid, hei);
     Image ii = (Image)bmp;
     Graphics gf = Graphics.FromImage(ii);
     IntPtr hdc = gf.GetHdc();
     BitBlt(hdcDest, 0, 0, wid, hei, (int)hdc, 0, 0, 0x00FF0062); //use whiteness flag to make destination screen white
     gf.Dispose();
     ii.Dispose();
     bmp.Dispose();

//Now copy the areas from each screen on the destination hbitmap
   Screen[] screendata = Screen.AllScreens;
   int X, X1, Y, Y1;
   for (int i = 0; i < screendata.Length; i++)
   {
       if (screendata[i].Bounds.X > (x + wid) || (screendata[i].Bounds.X + screendata[i].Bounds.Width) < x || screendata[i].Bounds.Y > (y + hei) || (screendata[i].Bounds.Y + screendata[i].Bounds.Height) < y )
       {// no common area
       }
       else { 
       // something  common
           if (x < screendata[i].Bounds.X) X = screendata[i].Bounds.X; else X = x;
           if ((x + wid) > (screendata[i].Bounds.X + screendata[i].Bounds.Width)) X1 = screendata[i].Bounds.X + screendata[i].Bounds.Width; else X1 = x + wid;
           if (y < screendata[i].Bounds.Y) Y = screendata[i].Bounds.Y; else Y = y;
           if ((y + hei) > (screendata[i].Bounds.Y + screendata[i].Bounds.Height)) Y1 = screendata[i].Bounds.Y + screendata[i].Bounds.Height; else Y1 = y + hei;
           // Main API that does memory data transfer
           BitBlt(hdcDest, X-x, Y-y , X1-X, Y1-Y, hdcSrc, X, Y, 0x40000000 | 0x00CC0020); //SRCCOPY AND CAPTUREBLT
       }
   }

// send image to clipboard
   Image  imf = Image.FromHbitmap(new IntPtr(hBitmap));
   Clipboard.SetImage(imf);
   DeleteDC(hdcSrc);
   DeleteDC(hdcDest);
   DeleteObject(hBitmap);
   imf.Dispose();

}

       /*   Unused Code
        public enum BLToption : int  // bitblit options....we need srccopy and captureblt
{
   SRCCOPY = 0x00CC0020,
   SRCPAINT = 0x00EE0086,
   SRCAND = 0x008800C6,
   SRCINVERT = 0x00660046,
   SRCERASE = 0x00440328,
   NOTSRCCOPY = 0x00330008,
   NOTSRCERASE = 0x001100A6,
   MERGECOPY = 0x00C000CA,
   MERGEPAINT = 0x00BB0226,
   PATCOPY = 0x00F00021,
   PATPAINT = 0x00FB0A09,
   PATINVERT = 0x005A0049,
   DSTINVERT = 0x00550009,
   BLACKNESS = 0x00000042,
   WHITENESS = 0x00FF0062,
   CAPTUREBLT = 0x40000000 
}
private static  void SaveImageAs(int hBitmap,string fileName,ImageFormat imageFormat)
{
Bitmap image = new Bitmap(Image.FromHbitmap(new IntPtr(hBitmap)),Image.FromHbitmap(new IntPtr(hBitmap)).Width, Image.FromHbitmap(new IntPtr(hBitmap)).Height);
Image img = (Image)image;
Clipboard.SetImage(img);
}
private static void Cleanup(int hBitmap,int hdcSrc,int hdcDest)
{
//ReleaseDC(GetDesktopWindow(),hdcSrc);
DeleteDC(hdcSrc);
DeleteDC(hdcDest);
DeleteObject(hBitmap);
} 
 public static string fileName;
public static ImageFormat imageFormat;      
*/




   }
}