Membership Generate Password alphanumeric only password?

Question

How can I use Membership.GeneratePassword to return a password that ONLY contains alpha or numeric characters? The default method will only guarantee a minimum and not a max

Answer 1

You could also try to generate passwords and concatenate the non alphanumeric characters until you reach the desired password length.

public string GeneratePassword(int length)
{
    var sb = new StringBuilder(length);

    while (sb.Length < length)
    {
        var tmp = System.Web.Security.Membership.GeneratePassword(length, 0);

        foreach(var c in tmp)
        {
            if(char.IsLetterOrDigit(c))
            {
                sb.Append(c);

                if (sb.Length == length)
                {
                    break;
                }
            }
        }
    }

    return sb.ToString();
}