protected void btnD_Click(object sender, EventArgs e) { ServiceReference1.Service1Client sr = new ServiceReference1.Service1Client(); var a = sr.Search_Ticket_By_PNR(pnr); int d = 0; foreach (var item in sr.Search_Ticket_By_PNR(pnr)) { if (item.Status == "active" && item.Departure_Date > DateTime.Now.Date) { d++; } } if (d>0) { ScriptManager.RegisterStartupScript(this, GetType(), "Thông báo", "alert('PNR tickets still exist. Can not Delete. Please, try again !!!');", true); } else { if (sr.Delete_Passengers(pnr) == 1) { ScriptManager.RegisterStartupScript(this, GetType(), "Thông báo", "alert('Delete passenger successed !!!');", true); dgPass.DataSource = sr.GetAll_Passengers(); dgPass.DataBind(); Reset(); } else { ScriptManager.RegisterStartupScript(this, GetType(), "Thông báo", "alert('Delete passenger failed !!!');", true); } } }