protected void ASPxPopupControl1_WindowCallback(object source, PopupWindowCallbackArgs e) { string[] parts = e.Parameter.Split(new char[] { '|' }, StringSplitOptions.RemoveEmptyEntries); int key = Convert.ToInt32(parts[1]); if (parts[0].Equals("APPLY")) { CommentsStorage.Set(key, parts[2], parts[3]); } else if (parts[0].Equals("DELETE")) { CommentsStorage.Delete(key, parts[2]); } }