protected override void OnPostExecute(JsonResult result) { dialog.Dismiss(); base.OnPostExecute(result); if (result != null) { var del = (from x in friendReq where x.ID == getRequestedFriend_Result.ID select x).FirstOrDefault(); if (del != null) { friendReq.Remove(del); } frienRequestAdapter.NotifyDataSetChanged(); } else { AlertBox.Create("Error", "Error", activity); } }