public void bind_nationality() { try { dtt = dl.bind_nationality(); ddl_nationality.Items.Clear(); ddl_nationality.DataSource = dtt.table; ddl_nationality.DataTextField = "nationality"; ddl_nationality.DataValueField = "num_code"; ddl_nationality.DataBind(); ddl_nationality.Items.Insert(0, new ListItem("Select Nationality", "0")); } catch (NullReferenceException) { // Utilities.MessageBox_UpdatePanel_Redirect(UpdatePanel2, "Your Session Has Expired Please Login Again", "../Logout.aspx"); } }