Today post is about how to run a asynchronous task in NSOperationQueue. Generally we do not run a Asynchronous task in NSOperationQueue. It is also not recommended for any programmer to do that. This post is only for learning purpose what will happen if we schedule a asynchronous task in a queue and how can we complete that task:). So let us move to the learning: NSOperationQueue: In iOS NSOperationQueue is a class, which provide a way to perform operation concurrently. We also have others way to perform concurrent operation: 1) GCD 2) NSThread 3) pThread NSOperationQueue is a wrapper on GCD, which provides a very convenient way to execute operation concurrently. To create a Queue for Operation you have to simply allocate a object of the class: NSOperationQueue * opertionQueue = [[ NSOperationQueue alloc ] init ]; For this post let suppose you are making a queue to handle all Http request in your application. So i want to create a queue in Handl...