Generic exception;Could not load type 'IBM.WMQ.MQDestination' from assembly 'amqmdnet

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ASP.NET

Hi,
I am trying to push Byte array into MQ using ASP.Net. But I am getting issue as “Generic exception;Could not load type 'IBM.WMQ.MQDestination' from assembly 'amqmdnet“. I am able able to push normal XML message .
Here is my code…any suggestions..

queue = queueManager.AccessQueue(….);
                message = strInputMsg;
                queueMessage = new MQMessage();
                utf8Enc = new UTF8Encoding();
                byte[] inputByteArray = utf8Enc.GetBytes(strInputMsg.ToCharArray());
                //**********************************************
                queueMessage.Write(inputByteArray);

                queueMessage.CharacterSet = 2208;
                queueMessage.Format = MQC.MQFMT_IMS_VAR_STRING;

                queuePutMessageOptions = new MQPutMessageOptions();
                queue.Put(queueMessage, queuePutMessageOptions);
                queueManager.Commit();

Thanks
Sreenath