中国身份证号码验证，支持15,18位，可验证成功90%的身份证号

using System;

/// <summary> /// Summary description for IDCardValid /// </summary> public class IDCardValid
{
    public IDCardValid()
    {
        //         // TODO: Add constructor logic here         //     }

    /// <summary>     /// 验证身份证号码     /// </summary>     /// <param name="Id">身份证号码</param>     /// <returns>验证成功为True，否则为False</returns>     public static 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;
        }
    }
 #region 身份证号码验证 
    /// <summary>     /// 验证15位身份证号     /// </summary>     /// <param name="Id">身份证号</param>     /// <returns>验证成功为True，否则为False</returns>     private static 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     }

    /// <summary>     /// 验证18位身份证号     /// </summary>     /// <param name="Id">身份证号</param>     /// <returns>验证成功为True，否则为False</returns>     private static 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     }
 #endregion }