Getting errors in MSMQ intermittent Specified cast is not valid on Sending

Question

I keep getting this error when I try and Send a message on a windows server 2008 R2 box. It works about 95% of the time but ever so often I get the following:
Log Entry : 4:29:44 AM Friday, April 17, 2015
  :Transaction Failed [Specified cast is not valid.]
Log Entry : 4:29:44 AM Friday, April 17, 2015
  :Stack Trace [   at System.Messaging.Interop.MessagePropertyVariants.Lock()
   at System.Messaging.MessageQueue.SendInternal(Object obj, MessageQueueTransaction internalTransaction, MessageQueueTransactionType transactionType)
   at ProdUwsCallbackService.ProdUwsCallbackService.SmsCallback(SmsCallbackRequest SmsCallbackRequest) in C:\NH Applications\VerizonNewProdGateway\WebProdUwsCallback\API\ProdUwsCallbackService.asmx.cs:line 318]
This happens about 7 or 8 times a night and it processes about 500 to 1000 messages before this happens. At about 4:30 in the morning I receive a large spike or volume of messages and it seems to happen around that time.
Here is the code snippet that is sending the MSMQ:
                            RxUwsCallbackVerizonProdMQ.Formatter = new XmlMessageFormatter(new Type[] { typeof(UwsRxMessage) });
                            //MessageQueueTransaction RxUwsCallbacVerizonProdTran = new MessageQueueTransaction();
                            try
                                //RxUwsCallbacVerizonProdTran.Begin();
                                //RxUwsCallbackVerizonProdMQ.Send(Message, Label, RxUwsCallbacVerizonProdTran);
                                NHUtils.WriteLog(VerizonUwsLogFile, "Putting SMS Message into Message Queue: [" + Label + "]");
                                lock (RxUwsCallbackVerizonProdMQ)
RxUwsCallbackVerizonProdMQ.Send(Message, MessageQueueTransactionType.Single);
                                //RxUwsCallbacVerizonProdTran.Commit();
                            catch (Exception ex)
                                //RxUwsCallbacVerizonProdTran.Abort();
                                NHUtils.WriteLog(VerizonUwsLogFile, "Transaction Failed [" + ex.Message + "]");
                                NHUtils.WriteLog(VerizonUwsLogFile, "Stack Trace [" + ex.StackTrace + "]");
The bold line is where the error is happening.
This is running as a application under IIS7 on a Windows 2008 R2 box.
Any help would greatly be appriciated on how to deal with this error or correct it. Thanks.

Answer 1

Hi Reggie,
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