.net验证身份证号是否符合规则

验证身份证号是否符合规则，比较实用，错判率我自己测试为0，挺好用的，欢迎大神补充。

protected bool checkidcard(string idcard)
        {
            //验证18位或者17位加大小写x
            Regex rg = new Regex(@"^\d{17}(\d|X|x)$");
            Match mc = rg.Match(idcard);
            string r = "";
            if (!mc.Success)
                return false;
            //验证前两位是否符合地区代码
            string[] area = { "11", "12", "13", "14", "15", "21", "22", "23", "31", "32", "33", "34", "35", "36", "37", "41", "42", "43", "44", "45", "46", "50", "51", "52", "53", "54", "61", "62", "63", "64", "65", "71", "81", "82", "91" };
            bool b = false;
            foreach(string a in area)
            {
                if (idcard.Substring(0, 2) == a)
                {
                    b = true;
                    break;
                }
            }
            if (b == false)
                return false;
            //验证出生日期
            string birthday = idcard.Substring(6, 4) + "/" + idcard.Substring(10, 2) + "/" + idcard.Substring(12, 2);
            try
            {
                Convert.ToDateTime(birthday);
            }
            catch
            {
                return false;
            }
            //验证最后一位校验位是否符合规则
            int i = (int.Parse(idcard.Substring(0, 1)) * 7)
                + (int.Parse(idcard.Substring(1, 1)) * 9)
                + (int.Parse(idcard.Substring(2, 1)) * 10)
                + (int.Parse(idcard.Substring(3, 1)) * 5)
                + (int.Parse(idcard.Substring(4, 1)) * 8)
                + (int.Parse(idcard.Substring(5, 1)) * 4)
                + (int.Parse(idcard.Substring(6, 1)) * 2)
                + (int.Parse(idcard.Substring(7, 1)) * 1)
                + (int.Parse(idcard.Substring(8, 1)) * 6)
                + (int.Parse(idcard.Substring(9, 1)) * 3)
                + (int.Parse(idcard.Substring(10, 1)) * 7)
                + (int.Parse(idcard.Substring(11, 1)) * 9)
                + (int.Parse(idcard.Substring(12, 1)) * 10)
                + (int.Parse(idcard.Substring(13, 1)) * 5)
                + (int.Parse(idcard.Substring(14, 1)) * 8)
                + (int.Parse(idcard.Substring(15, 1)) * 4)
                + (int.Parse(idcard.Substring(16, 1)) * 2);
            i = i - i / 11 * 11;
            switch (i)
            {
                case 0: r = "1"; break;
                case 1: r = "0"; break;
                case 2: r = "11"; break;
                case 3: r = "9"; break;
                case 4: r = "8"; break;
                case 5: r = "7"; break;
                case 6: r = "6"; break;
                case 7: r = "5"; break;
                case 8: r = "4"; break;
                case 9: r = "3"; break;
                case 10: r = "2"; break;
            }
            if (r == "11")
                r = "x";
            if (r == idcard.ToLower().Substring(17, 1))
                return true;
            else
                return false;
        }

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