public int loginCheck()
        {
            //-----------------------------------------------------------------
            string[] users = File.ReadLines("Username_Passwords").ToArray();
            //line of text file added to array
            //-----------------------------------------------------------------
            for (int i = 0; i < users.Length; i++)
            {
                string[] usernameAndPassword = users[i].Split('_');
                //usernames and passwords separated by '_' in file, split into two strings

                if (_username == usernameAndPassword[0] && _password == usernameAndPassword[1])
                {
                    return 1;
                    //return 1, could have used bool
                }

                else
                {
                    return 0;

                }
            }

public int loginCheck() {
        //-----------------------------------------------------------------
        string[] users = File.ReadLines("Username_Passwords").ToArray();
        //line of text file added to array
        //-----------------------------------------------------------------
        for (int i = 0; i < users.Length; i++) {
            string[] usernameAndPassword = users[i].Split('_');
            //usernames and passwords separated by '_' in file, split into two strings

            if (_username == usernameAndPassword[0] && _password == usernameAndPassword[1]) {
                return 1;
                //return 1, could have used bool
            }

            else {
                return 0;

            }
        }
        return 0;
    }