[DllImport("user32.dll")]
        static extern short GetAsyncKeyState(int vKey);

        public static string VKCodeToUnicode(uint vkCode) {

            StringBuilder buf = new StringBuilder();
            byte[] keyboardState = new byte[255];
            for (int i = 0; i < 255; i++)
                keyboardState[i] = (byte)GetAsyncKeyState(i);
            //if (!GetKeyboardState(keyboardState)) return string.Empty;

            ToUnicodeEx(vkCode, MapVirtualKey(vkCode, 0), keyboardState, buf, 5, 0, GetKeyboardLayout(0));
            return buf.ToString();
        }