generate randaom password(1 uuper case letter, 1 digit and 6 character length)

[ramanak]

Hi,

I want generate random password. it should contain at least 1 upper case letter, 1 digit, 6 character length.

I can use Membership.GeneratePassword(-, -), but its not having numbers some times.

Any help please?

Thank you.

[Tomy Rodrigue]

Hi Ramanak,

Here's a quick algorithm to do want you want to do. Sorry it's not the cleanest but it works. Didn't have plenty of time to test it though.

You can change the minimum and maximum number of chars. You can also add other chars (symbols, etc) if you want. You can also make it cleaner, but don't create the Random object in the function or it will always generate the same password.

Again, sorry it's not the cleanest but I think you get the idea.

Have a good day.

Tomy

        protected String RandomPassword()
        {
            String pwd = "";
            int length = 0;
            int index = 0;
            int numericIndex = -1;
            int upperCaseIndex = -1;
 
            //Length of your password
            length = rnd.Next(MINLENGTH, MAXLENGTH);
 
            // You generate a password of the desired length
            for (int i = 0; i < length; i++)
            {
                // Generate an index that smaller than the size of your allowed chars
                index = rnd.Next(0, allowedChars.Length);
 
                pwd += allowedChars[index];
            }
 
            ////*********************************************************
            // We make sure that there is at least one numeric
            // Replace one random char by a numeric
            numericIndex = rnd.Next(0, pwd.Length);
 
            // Generate a numeric, delete one char and replace it with a numeric
            index = rnd.Next(0, numericChars.Length);
            pwd = pwd.Remove(numericIndex, 1);
            pwd = pwd.Insert(numericIndex, numericChars[index].ToString());
            ////*********************************************************
 
 
            ////*********************************************************
            // We make sure that there is at least one uppercase
            // Replace one random char by a numeric
            upperCaseIndex = rnd.Next(0, pwd.Length);
 
            // We make sure our uppercase index is different
            // from our numeric index or we will overwrite our
            // only numeric value with our uppercase value
            while (upperCaseIndex == numericIndex)
            {
                upperCaseIndex = rnd.Next(0, pwd.Length);
            }
 
            // Generate a numeric, delete one char and replace it with a numeric
            index = rnd.Next(0, upperCaseChars.Length);
            pwd = pwd.Remove(upperCaseIndex, 1);
            pwd = pwd.Insert(upperCaseIndex, upperCaseChars[index].ToString());
            ////*********************************************************
 
            return pwd;
        }
 
        Random rnd = new Random();
        const int MINLENGTH = 6;
        const int MAXLENGTH = 20;
        const String allowedChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        const String upperCaseChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        const String numericChars = "0123456789";