DotNetMQ: A Complete Message Queue System for .NET

Introduction

In this article, I will introduce a new and independent Open Source Message Queue system that is entirely built in C# and .NET framework 3.5. DotNetMQ is a message broker that has several features including guaranteed delivering, routing, load balancing, server graphs... so on. I will start by explaining messaging concepts and the need for message brokers. Then I will examine what DotNetMQ is and how to use it.

What Is Messaging?

Messaging is a way of asynchronous communication of applications running on same or different machines with reliable delivery. Programs communicate by sending packets of data called messages to each other [1].
A message may be a string, a byte array, an object... etc. Typically, a sender (producer) program creates a message and pushes it to a message queue and a receiver (consumer) program gets the message from the queue and processes it. The sender and receiver programs don’t have to be running at the same time, since messaging is an asynchronous process. This is called loosely coupled communication.
On the other hand, a Web Service method call (Remote Method Invocation) is a type of tightly coupled and synchronous communication (both applications have to be running and available during the whole communication; if the Web Service is offline or an error occurs during the method call, the client application gets an exception).
More: http://www.codeproject.com/Articles/193611/DotNetMQ-A-Complete-Message-Queue-System-for-NET#Introduction