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");
     }
 }