private async void Send()
 {
     using (new Loading(this))
     {
         await GraphService.AcceptOrDecline(_meetingId, _action, Comment);
     }
 }
 private async void AcceptOrDeclineAndBack(string action, string comment, bool sendResponse)
 {
     using (new Loading(this))
     {
         await GraphService.AcceptOrDecline(Meeting.Id, action, comment, sendResponse);
     }
     GoBack();
 }