Thanks to MSDN, they don’t explain anything about it:
Can somebody please explain AsyncManager.OutstandingOperations with a simple example?
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It’s basically a counter that you should increment at the beginning of each asyncrhonous operation and decrement at the end. You should ensure to decrement it even if the operations fails. The value of this counter must always be zero when all processing has finished.
Here’s an article illustrating asynchronous controllers in ASP.NET MVC: http://msdn.microsoft.com/en-us/library/ee728598(v=vs.100).aspx