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return streamreader.ReadToEnd() }
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The <code>let!</code> indicates that the expression on the right (getting the response) should be done asynchronously but the flow should only continue when the result is available. In other words, from the point of view of the code block, it's as if getting the response is a blocking call, whereas from the point of view of the system, the thread won't be blocked and may be used to process other flows
The async block may be invoked using the <code>Async.RunSynchronously</code> function. Multiple async blocks can be executed in parallel using the <code>Async.Parallel</code> function that takes a list of <code>async</code> objects (in the example, <code>asynctask</code> is an async object) and creates another async object to run the tasks in the lists in parallel. The resultant object is invoked using <code>Async.RunSynchronously</code>.<ref name="aw">{{cite web |url=http://blogs.msdn.com/dsyme/archive/2007/10/11/introducing-f-asynchronous-workflows.aspx |title=Introducing F# Asynchronous Workflows |access-date=2007-12-14}}</ref>
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