private bool CheckIDCard(string Id)        {            if (Id.Length == 18)            {                bool check = CheckIDCard18(Id);                return check;            }            else if (Id.Length == 15)            {                bool check = CheckIDCard15(Id);                return check;            }            else            {                return false;            }        }        private bool CheckIDCard18(string Id)        {            long n = 0;            if (long.TryParse(Id.Remove(17), out n) == false || n < Math.Pow(10, 16) || long.TryParse(Id.Replace('x', '0').Replace('X', '0'), out n) == false)            {                return false;//数字验证              }            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";            if (address.IndexOf(Id.Remove(2)) == -1)            {                return false;//省份验证              }            string birth = Id.Substring(6, 8).Insert(6, "-").Insert(4, "-");            DateTime time = new DateTime();            if (DateTime.TryParse(birth, out time) == false)            {                return false;//生日验证              }            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(17).ToCharArray();            int sum = 0;            for (int i = 0; i < 17; i++)            {                sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());            }            int y = -1;            Math.DivRem(sum, 11, out y);            if (arrVarifyCode[y] != Id.Substring(17, 1).ToLower())            {                return false;//校验码验证              }            return true;//符合GB11643-1999标准          }        private bool CheckIDCard15(string Id)        {            long n = 0;            if (long.TryParse(Id, out n) == false || n < Math.Pow(10, 14))            {                return false;//数字验证              }            string address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";            if (address.IndexOf(Id.Remove(2)) == -1)            {                return false;//省份验证              }            string birth = Id.Substring(6, 6).Insert(4, "-").Insert(2, "-");            DateTime time = new DateTime();            if (DateTime.TryParse(birth, out time) == false)            {                return false;//生日验证              }            return true;//符合15位身份证标准          }