Credit card number Verification

Using System;namespace creditcards{//<summary>//Summary description for Creditcardvalidator.            </summary> public class Creditcardvalidator {public Creditcardvalidator () {//        Todo:add constructor logic here//} public bool Validatecc (string creditno)        {int indicator = 1;  --'ll be indicator for every and other number int firstnumtoadd = 0; --'ll be used to store sum of first set of numbers int secondnumtoadd = 0;            --'ll be used to store second set of numbers string num1;             --would be used if every and other number added is greater than, store the left-most integers here string num2;            --'ll be used if ever Yother number added are greater than, store the right-most integer here    --Convert Our Creditno string to a char array char[] Ccarr = Creditno.tochararray ();        for (int i=ccarr.length-1;i>=0;i--) {char ccnoadd = ccarr[i];                int ccadd = Int32.Parse (ccnoadd.tostring ()); if (indicator = = 1) {//--If we is on the odd number of numbers, Add. Number to OU                    R total Firstnumtoadd + = Ccadd;                --Set our indicator to 0 so, our code would know to skip to the next piece indicator = 0;                    } else {//--If the current integer doubled is greater than 10 --Split the sum in to, integers and add them together//--we then add it to O  ur total here if ((Ccadd + ccadd) >=) {int temporary =                        (Ccadd + ccadd); NUM1 = temporary. ToString ().                        Substring (0,1); num2 = temporary. ToString (). Substring ();                    Secondnumtoadd + = (Convert.ToInt32 (NUM1) + Convert.ToInt32 (num2)); } else {//--Otherwise, just add them together and add them                    To We total secondnumtoadd + = Ccadd + Ccadd;                    }//--set our indicator to 1 so for the next integer we'll perform a different set of code                indicator = 1; }}//--If the sum of our 2 numbers are divisible by ten, then the card is valid.            Otherwise, it is not bool IsValid = false;            if ((Firstnumtoadd + secondnumtoadd)% = = 0) {IsValid = true;            } else {isValid = false;        } return isValid; }///<summary>//Get and check to make sure, the chosen credit card type matches the// /Card number//</summary>//<param name= "Ccnum" >string</param>//&LT;RETURNS&GT;BOOL&L            T;/returns> public bool Retrievecctype (string ccnum, int intchosentype) {//return value            BOOL Bresult = false;                 if (Convert.ToInt32 (ccnum.substring (0,2)) >= Wuyi && Convert.ToInt32 (ccnum.substring (0,2)) <= 55) {                 Check to see which the type of card that the user selected//matches the                if (Intchosentype = = 3) {bresult = true;                } else {bresult = false;                }} else if (Convert.ToString (ccnum.substring (0,1)) = = "4") {//Visa                if (Intchosentype = = 4) {bresult = true; } else {bresult =False }} else if (Convert.ToString (ccnum.substring (0,2)) = = "34" | |  Convert.ToString (ccnum.substring (0,2)) = = "PNs") {//American Express//Check to See that the card matches the type they chose if (Intchosentype = = 1) {b                Result = true;                } else {bresult = false; }} else if (Convert.ToString (ccnum.substring (0,4)) = = "6011") {//Discove                R card if (Intchosentype = = 2) {bresult = true;                } else {bresult = false;            }} else {bresult = false;        } return bresult; }    }}

　　

Credit card number Verification