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copied!<p>I think that all the <code>BeginXyz</code> operations that implement the standard asynchronous programming model run the callback on a thread pool thread, which makes the application automatically multi-threaded.</p> <p>However, you can achieve single-threaded asynchronous programming model by synchronizing all the operations through the single GUI thread that is maintained for windows applications using <code>Control.Invoke</code> or more generally, <code>SynchronizationContext</code>.</p> <p>Each call to <code>BeginXyz</code> would have to be rewritten along these lines:</p> <pre><code>// Start asynchronous operation here (1) var originalContext = SynchronizationContext.Current; obj.BeginFoo(ar => // Switch to the original thread originalContext.Post(ignored => { var res = obj.EndFoo(); // Continue here (2) })); </code></pre> <p>The code marked as (2) will continue running on the same thread as the code in (1), so you'll use the thread-pool thread only for forwarding the postback back to the original (single) thread.</p> <p>As a side-note, this is more directly supported by asynchronous workflows in F# and it can be used for quite elegant style of GUI programming <a href="http://dotnetslackers.com/articles/net/Programming-user-interfaces-using-f-sharp-workflows.aspx" rel="noreferrer">as described here</a>. I don't know <code>node.js</code>, but I suppose that you may be also amazed by F# <em>asynchronous workflows</em> as they are really cool for asynchronous/event based/... style of programming :-)</p>

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