Zetbox.Client.BasicAuthCredentialsResolver.EnsureCredentials C# (CSharp) Method

        public void EnsureCredentials()
        {
            lock (_lock)
            {
                if (_isEnsuringCredentials)
                {
                    Logging.Client.Warn("Nested credentials resolving detected");
                    // singleton, once is enough
                    return;
                }
                _isEnsuringCredentials = true;
            }
            try
            {
                if (string.IsNullOrEmpty(UserName))
                {
                    if (_pwDlg.QueryUser())
                    {
                        this.UserName = _pwDlg.Username;
                        this.Password = _pwDlg.Password;
                    }
                    else
                    {
                        // No credentials? User pressed cancel? exit application
                        Environment.Exit(1);
                    }
                }
            }
            finally
            {
                lock (_lock) _isEnsuringCredentials = false;
            }
        }