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[DllImport("user32.dll")]
        static extern IntPtr GetDC(IntPtr hWnd);

        [DllImport("gdi32.dll")]
        static extern int GetDIBits(IntPtr hdc, IntPtr hbmp, uint uStartScan, uint cScanLines, [Out] byte[] lpvBits, ref BITMAPINFO lpbmi, uint uUsage);

        [StructLayout(LayoutKind.Sequential)]
        public struct BITMAPINFOHEADER
        {
            public uint biSize;
            public int biWidth;
            public int biHeight;
            public ushort biPlanes;
            public ushort biBitCount;
            public uint biCompression;
            public uint biSizeImage;
            public int biXPelsPerMeter;
            public int biYPelsPerMeter;
            public uint biClrUsed;
            public uint biClrImportant;

            public void Init()
            {
                biSize = (uint)Marshal.SizeOf(this);
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct BITMAPINFO
        {
            public Int32 biSize;
            public Int32 biWidth;
            public Int32 biHeight;
            public Int16 biPlanes;
            public Int16 biBitCount;
            public Int32 biCompression;
            public Int32 biSizeImage;
            public Int32 biXPelsPerMeter;
            public Int32 biYPelsPerMeter;
            public Int32 biClrUsed;
            public Int32 biClrImportant;
        }

        public bool CompareBitmaps(IntPtr HBitmapLeft, IntPtr HBitmapRight)
        {
            if (HBitmapLeft == HBitmapRight)
            {
                return true;
            }

            if (HBitmapLeft == IntPtr.Zero|| HBitmapRight == IntPtr.Zero)
            {
                return false;
            }

            bool bSame = false;

            IntPtr hdc = GetDC(IntPtr.Zero);

            BITMAPINFO BitmapInfoLeft = new BITMAPINFO();
            BITMAPINFO BitmapInfoRight = new BITMAPINFO();

            BitmapInfoLeft.biSize = Marshal.SizeOf(BitmapInfoLeft);
            BitmapInfoRight.biSize = Marshal.SizeOf(BitmapInfoRight);