var strTitle = string.Empty;

            IntPtr hwnd = GetForegroundWindow();

            var intLength = GetWindowTextLength(hwnd) + 1;
            var stringBuilder = new StringBuilder(intLength);


            if (LastWindow != hwnd)
            {
                if (GetWindowText(hwnd, stringBuilder, intLength) > 0)
                {
                    strTitle = stringBuilder.ToString();
                }

                MessageLabel.Text = strTitle.ToString();
                LastWindow = hwnd;
            }