private void can_Submit_MouseDown(object sender, MouseButtonEventArgs e) { connect = new CTUConnection(); try { if (txt_Serial.MaxLength != 13 || string.IsNullOrEmpty(txt_Serial.Text)) { MessageBox.Show("Please enter a serial number for the vehicle"); } else if (string.IsNullOrEmpty(txt_Brand.Text)) { MessageBox.Show("Please enter the serial number of the vehicle"); } else if (string.IsNullOrEmpty(txt_Color.Text)) { MessageBox.Show("Please enter the color of vehicle"); } else if (string.IsNullOrEmpty(txt_Model.Text)) { MessageBox.Show("Please enter the model of the vehicle"); } else if (string.IsNullOrEmpty(txt_Price.Text)) { MessageBox.Show("Please enter the price of the vehicle"); } else if (string.IsNullOrEmpty(txt_Speed.Text)) { MessageBox.Show("Please enter the current speed of the vehicle"); } else if (Rad_Good.IsChecked == false && Rad_Bad.IsChecked == false && Rad_Average.IsChecked == false) { MessageBox.Show("Please select the condition of the vehicle"); } else if (Rad_Used.IsChecked == false && Rad_Demo.IsChecked == false) { MessageBox.Show("Please select the type of vehicle"); } else { connect.GetOldVehicles(txt_Brand.Text, txt_Model.Text, txt_Serial.Text, txt_Color.Text, Type, txt_Price.Text, txt_ServiceHis.Text, Convert.ToInt64(txt_Speed.Text), Condition); } } catch (FormatException) { } }