身份证号码验证函数

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private bool CheckCardNumber(string number) {     int[] iW = new int[] { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1 };     int iSum = 0;     for (int i = 0; i < 17; i++)     {         int iVal = 0;         int.TryParse(number[i].ToString(), out iVal);            iSum += iVal * iW[i];     }        int iCheck = iSum % 11;        string check = string.Empty;        switch (iCheck)     {         case 0: check = "1"; break;         case 1: check = "0"; break;         case 2: check = "x"; break;         case 3: check = "9"; break;         case 4: check = "8"; break;         case 5: check = "7"; break;         case 6: check = "6"; break;         case 7: check = "5"; break;         case 8: check = "4"; break;         case 9: check = "3"; break;         case 10: check = "2"; break;     }        string valid = number[17].ToString().ToLower();        return valid == check; }