private void OkButton_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { short year = 0; decimal price = 0; decimal worth = 0; if (short.TryParse(YearBox.Text, out year) && decimal.TryParse(PriceBox.Text, out price) && decimal.TryParse(WorthBox.Text, out worth) == true && YearBox.Text.Length == 4) { CarRentalDbWorker.AddNewCar(_connection, GovNumBox.Text, ModelBox.Text, ColorBox.Text, year, price, worth); DialogResult = true; Close(); } else { MessageBox.Show("Неверно введены данные"); } }