Generate Check Digit Using LUHN Formula?
Jan 11, 2011
Could anyone please give me some code to generate Check Digit base on LUHN formula. Suppose i pass 15 digit of credit card number then fuction should calculate and generate the Check Digit.I found some link but it is MS SQL function and i tried it work well except if check digit is 0 it will return 1 so i get confused, because some time Check Digit is also 1 so in both cause this function returning 1.http://www.codeproject.com/Tips/120472/SQL-function-to-verify-Check-Digit-of-given-VISA-M.aspxI will appreciate if some one can give me VB code.
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Jun 26, 2010
I cant seem to figure out what is wrong with my check digit code!
At times, it produces 2 length check digit values
Example
1277531815000110 <-- check digit is double value??????
1277532495000110 <-- check digit is double value???????
1277534649000110 <-- check digit is double value???????
127753185300011 <-- good!
127753208500019 <-- good!
All generated numbers are valid, it can be checked at http://www.ee.unb.ca/cgi-bin/tervo/luhn.pl?N=127753224800013
CODE: http://tinyurl.com/352acpj
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public string ACtivationKey()
{
string allowedChars = "";
allowedChars = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,";
allowedChars += "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,";
allowedChars += "1,2,3,4,5,6,7,8,9,0";
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