gdikit

 enum TernaryRasterOperations : uint
    {
      /// <summary>dest = source</summary>
      SRCCOPY = 0x00CC0020,
      /// <summary>dest = source OR dest</summary>
      SRCPAINT = 0x00EE0086,
      /// <summary>dest = source AND dest</summary>
      SRCAND = 0x008800C6,
      /// <summary>dest = source XOR dest</summary>
      SRCINVERT = 0x00660046,
      /// <summary>dest = source AND (NOT dest)</summary>
      SRCERASE = 0x00440328,
      /// <summary>dest = (NOT source)</summary>
      NOTSRCCOPY = 0x00330008,
      /// <summary>dest = (NOT src) AND (NOT dest)</summary>
      NOTSRCERASE = 0x001100A6,
      /// <summary>dest = (source AND pattern)</summary>
      MERGECOPY = 0x00C000CA,
      /// <summary>dest = (NOT source) OR dest</summary>
      MERGEPAINT = 0x00BB0226,
      /// <summary>dest = pattern</summary>
      PATCOPY = 0x00F00021,
      /// <summary>dest = DPSnoo</summary>
      PATPAINT = 0x00FB0A09,
      /// <summary>dest = pattern XOR dest</summary>
      PATINVERT = 0x005A0049,
      /// <summary>dest = (NOT dest)</summary>
      DSTINVERT = 0x00550009,
      /// <summary>dest = BLACK</summary>
      BLACKNESS = 0x00000042,
      /// <summary>dest = WHITE</summary>
      WHITENESS = 0x00FF0062,
      /// <summary>
      /// Capture window as seen on screen.  This includes layered windows
      /// such as WPF windows with AllowsTransparency="true"
      /// </summary>
      CAPTUREBLT = 0x40000000
    }

    [DllImport("gdi32.dll", EntryPoint = "BitBlt", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool BitBlt([In] IntPtr hdc, int nXDest, int nYDest, int nWidth, int nHeight, [In] IntPtr hdcSrc, int nXSrc, int nYSrc, TernaryRasterOperations dwRop);

    [DllImport("gdi32.dll", EntryPoint = "CreateCompatibleDC", SetLastError = true)]
    static extern IntPtr CreateCompatibleDC([In] IntPtr hdc);

    [DllImport("gdi32.dll", EntryPoint = "SelectObject")]
    public static extern IntPtr SelectObject([In] IntPtr hdc, [In] IntPtr hgdiobj);

    Random ll = new Random();
    [DllImport("User32.dll")]
    static extern IntPtr GetDC(IntPtr hwnd);

    [DllImport("User32.dll")]
    static extern int ReleaseDC(IntPtr hwnd, IntPtr dc);

    [DllImport("gdi32.dll")]
    static extern bool PatBlt(IntPtr hdc, int nXLeft, int nYLeft, int nWidth, int nHeight, TernaryRasterOperations dwRop);

    [DllImport("gdi32.dll")]
    static extern IntPtr CreateSolidBrush(uint crColor);

    private Bitmap CaptureScreen()
    {



      Graphics myGraphics = this.CreateGraphics();
      Size s = this.Size;
      Bitmap memoryImage = new Bitmap(s.Width, s.Height, myGraphics);
      Graphics memoryGraphics = Graphics.FromImage(memoryImage);
      memoryGraphics.CopyFromScreen(this.Location.X, this.Location.Y, 0, 0, s);
      return memoryImage;
    }