public void Test_CreateImage()
        {
            var code = "";

            _coder.RandomPointPercent = 5;
            _coder.Height             = 50;
            _coder.RandomColor        = true;
            using (var image = _coder.CreateImage(4, out code, CaptchaType.ChineseChar))
            {
                image.Save("D:\\test.png");
            }
            Output.WriteLine(code);
        }