//авторизация private void Open_Login_Screen(object sender, RoutedEventArgs e) { UserAutorisation autorisationWindow = new UserAutorisation(); if (autorisationWindow.ShowDialog() == true) { string Nickname = autorisationWindow.tbNickName.Text; string Password = autorisationWindow.tbPassword.Password; if (autorisationWindow.tbNickName.Text != "" && autorisationWindow.tbPassword.Password != "") { bool result = client.Check_User(Nickname, Password); if (result == false) { MessageBox.Show("User does not exist. Try another login or password", "Attention!", MessageBoxButton.OK, MessageBoxImage.Error); } else { tblockUserName.Text = Nickname; tblockUserName.Foreground = Brushes.Red; } } else { MessageBox.Show("Username and password fields can not be empty!", "Attention!", MessageBoxButton.OK, MessageBoxImage.Error); } } }