C# Format string type amount

   /// <summary>
        /// 根据精度将金额转换为自定义类型的string
        /// </summary>
        /// <param name="precision">需要的精度</param>
        /// <param name="money">需要转换的金额</param>
        /// <returns>转换后的金额</returns>
        public  string FormateString(int precision, double money)
        {
            //比如，FormateString(2,2333)==>结果：2,333.00
            string format = "###,###,###,##0.";
            for (int i = 0; i < precision; i++)
            {
                format = format + "0";
            }
            return money.ToString(format);
        }
        /// <summary>
        /// 转换任意类型的对象为Double
        /// </summary>
        /// <param name="val">需要转换的对象</param>
        /// <returns>返回Double类型的变量</returns>
        public  double ConvertDouble(object val)
        {
            if (((val == null) || (val.ToString() == "")) || (val is DBNull))
            {
                return 0.0;
            }
            if (val is string)
            {
                val = val.ToString().Replace(",", "");
            }
            try
            {
                return Convert.ToDouble(val);
            }
            catch
            {
                return 0.0;
            }
        }