C#验证身份证号码正确性

18位号码：

   private static bool CheckIDCard18(string Id)
         {
             long n = ;
             if (long.TryParse(Id.Remove(), out n) == false || n < Math.Pow(, ) || long.TryParse(Id.Replace('x', '').Replace('X', ''), out n) == false)
             {
                 return false;
             }
             string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
             if (address.IndexOf(Id.Remove()) == -)
             {
                 return false;
             }
             string birth = Id.Substring(, ).Insert(, "-").Insert(, "-");
             DateTime time = new DateTime();
             if (DateTime.TryParse(birth, out time) == false)
             {
                 return false;
             }
             string[] arrVarifyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');
             string[] Wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');
             char[] Ai = Id.Remove().ToCharArray();
             int sum = ;
             for (int i = ; i < ; i++)
             {
                 sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());
             }
             int y = -;
             Math.DivRem(sum, , out y);
             if (arrVarifyCode[y] != Id.Substring(, ).ToLower())
             {
                 return false;
             }
             return true;//正确
         }

15位号码：

   private static bool CheckIDCard15(string Id)
        {
            long n = ;
            if (long.TryParse(Id, out n) == false || n < Math.Pow(, ))
            {
                return false;
            }
            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
            if (address.IndexOf(Id.Remove()) == -)
            {
                return false;
            }
            string birth = Id.Substring(, ).Insert(, "-").Insert(, "-");
            DateTime time = new DateTime();
            if (DateTime.TryParse(birth, out time) == false)
            {
                return false;
            }
            return true;//正确
        }