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