sending notification failed with payload in c#

Question

I am trying to send notification on Iphone with payload which is getting failed ..same code is working fine without payload

AppleNotificationPayload p = new AppleNotificationPayload();
p.AddCustom("clientcode", "sdfsdfsdf");
p.AddCustom("lotId", "sdfdsfsdf");
p.AddCustom("productCode", "sdfsdffsd");

String gcm_token = dtnoti_GcmList.Rows[r]["gcmToken"].ToString().Trim();
String DeviceType = dtnoti_GcmList.Rows[r]["deviceType"].ToString().Trim();
push.QueueNotification( new AppleNotification()
.ForDeviceToken(Convert.ToString(dtnoti_GcmList.Rows[r]["gcmToken"]))
.WithAlert(Convert.ToString(message))
.WithBadge(1)
.WithContentAvailable(1)
.WithPayload(p)
.WithCategory(Convert.ToString("TradingVivekamAlert"))
.WithSound("sound.caf"));

when i remove .WithPayload(p) it works fine