MSMQ operations in C#

Following code snippet demonstrate the way to do some common operations with Microsoft Message Queuing (MSMQ)-

1) Send message in MSMQ -

string queueName = @".\Private$\MyMSMQ";
string myMessage = "Hello World";    
MessageQueue messageQueue = null;
Message oMsg = null;

//Sending Messages to MSMQ
if (MessageQueue.Exists(queueName))
{
    messageQueue = new MessageQueue(queueName);

    oMsg = new Message(myMessage);
    messageQueue.Send(oMsg);    
}
else
{
    //Create the MessageQueue 
    messageQueue = MessageQueue.Create(queueName);
    //Set Queue permission
    //messageQueue.SetPermissions("Everyone", MessageQueueAccessRights.FullControl,
    //                             AccessControlEntryType.Set);
    messageQueue.SetPermissions("Everyone",
                        MessageQueueAccessRights.PeekMessage | 
                        MessageQueueAccessRights.ReceiveMessage | 
                        MessageQueueAccessRights.DeleteMessage | 
                        MessageQueueAccessRights.WriteMessage, 
                        AccessControlEntryType.Set);

    oMsg = new Message(myMessage);
    messageQueue.Send(oMsg);
}

2) Receive Message from MSMQ -

string myMessage= string.Empty;
string queueName = @".\Private$\MyMSMQ";

//Receiving Messages from MSMQ
MessageQueue messageQueue = new MessageQueue(queueName);

//To keep a check that if no messages present in MSMQ,
//control should return back in 1 second. 
TimeSpan timeout = new TimeSpan(1);
Message message = null;

//Get all the messages present in the MSMQ and iterate through it.
MessageEnumerator enumerator = messageQueue.GetMessageEnumerator2();

if (enumerator.MoveNext())
    message = enumerator.RemoveCurrent(timeout);

if (message != null)
{
    messageBody = message.Body.ToString();
}

3) Display all the messages present in the MSMQ (without removing messages from queue)

StringBuilder allMessages = new StringBuilder();
string queueName = @".\Private$\MyMSMQ";

//Enumerating Messages from MSMQ
MessageQueue oMq = new MessageQueue(queueName);

foreach (Message message in oMq)
{
    stringBuilder.Append(message.Body + ";");
}

4) Deletes all the messages contained in the MSMQ queue

string queueName = @".\Private$\MyMSMQ";

//Deletes all the messages contained in the MSMQ queue
MessageQueue messageQueue = new MessageQueue(queueName);
messageQueue.Purge();

Nice link to refer -
Use Microsoft Message Queuing in C# for inter-process communication