public async Task AddNotificationAsync()
        {
            DoLongWork();
            try
            {
                RawNotification.SharedLibs.JSONObjectSerializer <string> serializer = new RawNotification.SharedLibs.JSONObjectSerializer <string>();
                byte[] previewDatainBytes = serializer.ObjectToBytes(PreviewData);
                byte[] contentDatainBytes = serializer.ObjectToBytes(ContentData);
                ObservableCollection <string> selectedList = new ObservableCollection <string>(_Customers.Where(c => c.Selected == true).Select(c => c.Id.ToString()));

                RNServerService.RNServerCommunicatorClient sv = new RNServerService.RNServerCommunicatorClient();
                var result = await sv.AddNotificationAsync(contentDatainBytes, previewDatainBytes, selectedList);

                if (result.StatusCode != RawNotification.Models.ResultStatusCodes.OK)
                {
                    throw new Exception(result.Message);
                }
                else
                {
                    await new MessageDialog("Adding notification successfull", "Success").ShowAsync();
                }
            }
            catch (Exception ex)
            {
                await new MessageDialog(ex.Message, "Error").ShowAsync();
            }
            FinishDoLongWork();
        }
        public async Task SendNotificationAsync()
        {
            DoLongWork();
            try
            {
                RNServerService.RNServerCommunicatorClient service = new RNServerService.RNServerCommunicatorClient();
                var result = await service.SendAllNotificationAsync();

                if (result.StatusCode != RawNotification.Models.ResultStatusCodes.OK)
                {
                    throw new Exception(result.Message);
                }
                else
                {
                    await new MessageDialog("Adding notification successfull", "Success").ShowAsync();
                }
            }
            catch (Exception ex)
            {
                await new MessageDialog(ex.Message, "Error").ShowAsync();
            }
            FinishDoLongWork();
        }