// GET: Administrators
 public ActionResult Index()
 {
     AppWebHelper hlp = new AppWebHelper(HttpContext.Request.QueryString[Constants.SPAppWebUrl] as string);
     List<Administrator> model = hlp.GetAdministrators();
     return View(model);
     
 }
 public ActionResult Delete(int id, FormCollection collection)
 {
     try
     {
         AppWebHelper hlp = new AppWebHelper(
             HttpContext.Request.QueryString[Constants.SPAppWebUrl] as string);
         hlp.DeleteAdministrator(id);
         return View("Index", hlp.GetAdministrators());
     }
     catch (Exception ex)
     {
         LogHelper.Log(ex.Message + ex.StackTrace, LogSeverity.Error);
         throw;
     }
 }