AddUser() private method

private AddUser ( string username, string password ) : string
username string
password string
return string
        public static void Main(string[] args)
        {
            Vulnerable v = new Vulnerable();

            string[] users = v.ListUsers();

            foreach (string user in users)
                Console.WriteLine(user);

            Console.WriteLine("Adding user blah:blah");
            v.AddUser("blah", "blah");

            users = v.ListUsers();

            foreach (string user in users)
                Console.WriteLine(user);

            Console.WriteLine("Selecting only blah");
            string u = v.GetUser("blah");

            Console.WriteLine(u);

            Console.WriteLine("Deleteing user blah");
            bool worked = v.DeleteUser("blah");

            Console.WriteLine("Worked? " + worked);

            Console.WriteLine("Attempting to select blah again");
            u = v.GetUser("blah");

            Console.WriteLine(u);
        }
        public static void Main(string[] args)
        {
            Vulnerable v = new Vulnerable();

            string[] users = v.ListUsers();

            foreach (string user in users)
            {
                Console.WriteLine(user);
            }

            Console.WriteLine("Adding user blah:blah");
            v.AddUser("blah", "blah");

            users = v.ListUsers();

            foreach (string user in users)
            {
                Console.WriteLine(user);
            }

            Console.WriteLine("Selecting only blah");
            string u = v.GetUser("blah");

            Console.WriteLine(u);

            Console.WriteLine("Deleteing user blah");
            bool worked = v.DeleteUser("blah");

            Console.WriteLine("Worked? " + worked);

            Console.WriteLine("Attempting to select blah again");
            u = v.GetUser("blah");

            Console.WriteLine(u);
        }