protected void btnU_Click(object sender, EventArgs e)
 {
     ServiceReference1.Passenger passenger = new ServiceReference1.Passenger();
     passenger.PNR = pnr;
     passenger.Passenger_Name = txtName.Text;
     passenger.Date_Of_Birth = DateTime.Parse(txtBirth.Text);
     passenger.Phone_Number = txtPhone.Text;
     passenger.Email = txtE.Text;
     ServiceReference1.Service1Client sr = new ServiceReference1.Service1Client();
     if (sr.Update_Passengers(passenger) == 1)
     {
         ScriptManager.RegisterStartupScript(this, GetType(), "Thông báo", "alert('Update successed !!!');", true);
         dgPass.DataSource = sr.GetAll_Passengers();
         dgPass.DataBind();
         Reset();
     }
     else
     {
         ScriptManager.RegisterStartupScript(this, GetType(), "Thông báo", "alert('Update failed !!!');", true);
     }
     
 }