. NET verifies that a social security number conforms to a rule

Verify that the ID number is in accordance with the rules, more practical, the wrong rate of my own test for 0, very easy to use, welcome to the great God to add.

protected bool Checkidcard (string idcard) {//verify 18-bit or 17-bit XL lowercase x regex rg = new Regex (@ "^\d{17} ( \d|            X|X) $ "); Match MC = RG.            Match (Idcard);            string r = ""; if (!MC.            Success) return false;  Verify that the first two digits meet the region code 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; Verify the Birth date string birthday = Idcard. Substring (6, 4) + "/" + Idcard. Substring (2) + "/" + Idcard.            Substring (12, 2); try {Convert.todAtetime (birthday);            } catch {return false; }//Verify that the last check digit conforms to the rule int i = (int. Parse (Idcard. Substring (0, 1)) * 7) + (int. Parse (Idcard. Substring (1, 1)) * 9) + (int. Parse (Idcard. Substring (2, 1)) * + (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 (ten, 1)) * 7) + (int. Parse (Idcard. Substring (one, 1)) * 9) + (int. Parse (Idcard. Substring (1)) + (int. Parse (Idcard. Substring (1)) * 5) + (int. Parse (Idcard. Substring (14, 1)) * 8) + (int. Parse (Idcard. Substring (1)) * 4) + (int. Parse (Idcard.            Substring (16, 1)) * 2);            i = i-i/11 * 11;                switch (i) {case 0:r = "1"; 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 = = "One") R = "X"; if (r = = Idcard. ToLower ().            Substring (1)) return true;        else return false; }

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. NET verifies that a social security number conforms to a rule