private static User UserLogin(Users usrs)
        {
            User currUser = null;
            
            do
            {
                // Prompt for user input
                Console.WriteLine();
                Console.WriteLine("Enter Username:"******"You entered an invalid user.";
                    // Invalid User
                    ShowErrMsg(errText);
                }

                // if valid user
                if (valUsr)
                {
                    // Prompt for user input
                    Console.WriteLine("Enter Password:"******"You entered an invalid password.";
                        // Invalid Password
                        ShowErrMsg(errText);
                    }
                }

            } while(currUser == null);

            return currUser;
        }