C#中英文逗号之间的相互转化

根据ASCII码表来判断该字符是否为逗号 此方法效率较低

  //中文逗号转英文逗号
        public string YingDaoZhong(string Ying)
        {
            string rest = "";
            char douHao = '，';
            int a = douHao;
           // MessageBox.Show(a.ToString());
            for (int i = 0; i < Ying.Length; i++)
            {
                char c = Ying[i];
                if (c == douHao)
                {
                    rest += ",";
                }
                else
                {
                    rest += Ying[i];
                }
            }
            return rest;
        }
        //中文逗号转英文逗号
        public string ZhongDaoYing(string Zhong)
        {
            string rest = "";
            char douHao = ',';
            int a = douHao;
           // MessageBox.Show(a.ToString());
            for (int i = 0; i < Zhong.Length; i++)
            {
                char c = Zhong[i];              
                if (c == douHao)
                {
                    rest += "，";
                }
                else
                {
                    rest += Zhong[i];
                }
            }
            return rest;
        }