private void can_Submit_MouseDown(object sender, MouseButtonEventArgs e)
        {
            connect = new CTUConnection();

            try
            {
                if (string.IsNullOrEmpty(txt_CustCar.Text))
                {
                    MessageBox.Show("Please enter the name of the vehicle");
                }

                else if (string.IsNullOrEmpty(txt_Prob.Text))
                {
                    MessageBox.Show("Please enter the problem of the vehicle");
                }

                else
                {
                    connect.GetCarServices(txt_CustCar.Text, Convert.ToDateTime(DTP_Date.SelectedDate.ToString()), txt_Prob.Text, int.Parse(cmbx_Mech.SelectedValue.ToString()), int.Parse(cmbx_Cust.SelectedValue.ToString()));
                }
            }

            catch (FormatException)
            {
                MessageBox.Show("Please select a date");
            }

            catch (NullReferenceException)
            {
                MessageBox.Show("Please select a Mechanic");
            }
        }