private void End_Registration(object sender, RoutedEventArgs e) { if (model.CheckingLogin(TextLogin.Text) == true) { if ((PasswordPass.Password != "") && (TextName.Text != "") && (TextLogin.Text != "") && (TextAge.ToString() != "")) { string a = TextLogin.Text; string b = TextName.Text; int c = Int32.Parse(TextAge.Text); string d = PasswordPass.ToString(); model.AddUser(a, b, c, d); MessageBox.Show("You are registred"); SignIn open = new SignIn(); open.Show(); this.Close(); } else { MessageBox.Show("All fields must be filled"); } } else { MessageBox.Show("This login is reserved."); } }