C# Windows Screen Capture

Okay, here is the problem: I have managed to get a screen capture and turn it into a bitmap, using only one API call (I don't know if this is significant, but I know I started with about 10...).

My question, is how I can get rid of this BitBlt API call?


    [System.Runtime.InteropServices.DllImport("gdi32.dll")]
    private static extern int BitBlt(int srchDC, int srcX, int srcY, int srcW, int srcH, int desthDC, int destX, int destY, int op);
   
    private static System.Drawing.Bitmap CaptureScreen()
    {
      System.Drawing.Graphics displayGraphics = System.Drawing.Graphics.FromHwnd(IntPtr.Zero);
      using(displayGraphics)
      {
        System.Drawing.Rectangle screenBounds = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
        System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(screenBounds.Width, screenBounds.Height, displayGraphics);
         
        IntPtr displayHdc = displayGraphics.GetHdc();
        try
        {
          System.Drawing.Graphics bitmapGraphics = System.Drawing.Graphics.FromImage(bitmap);
          using(bitmapGraphics)
          {
            IntPtr bitmapHdc = bitmapGraphics.GetHdc();
            try
            {
              const int SRCCOPY = 13369376;          
              BitBlt(bitmapHdc.ToInt32(), 0, 0, screenBounds.Width, screenBounds.Height, displayHdc.ToInt32(), 0, 0, SRCCOPY);

              return bitmap;
            }
            finally
            {
              bitmapGraphics.ReleaseHdc(bitmapHdc);
            }
          }
        }
        finally
        {
          displayGraphics.ReleaseHdc(displayHdc);
        }
      }
    }