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    <p>It is possible, but it would be awkward and difficult to get right. The best way to make this happen is to use <a href="http://en.wikipedia.org/wiki/Coroutine" rel="nofollow noreferrer">coroutines</a>. The only mechanism in .NET that currently fits the coroutine paradigm is C#'s iterators via the <code>yield return</code> keyword. You <em>could</em> theorectically hack something together that allows the execution of a method to transition from one thread to another<sup>1</sup>. However, this would be nothing less than a blog worthy hack, but I do think it is possible.<sup>2</sup></p> <p>The next best option is to go ahead and upgrade to the <a href="http://msdn.microsoft.com/en-us/vstudio/async.aspx" rel="nofollow noreferrer">Async CTP</a>. This is a feature that will be available in C# and which will allow you do exactly what you are asking for. This is accomplished elegantly with the proposed <code>await</code> keyword and some clever exploits that will also be included. The end result would look something like the follwing.</p> <pre><code>public async void SomeMethod() { // Do stuff on the calling thread. await ThreadPool.SwitchTo(); // Switch to the ThreadPool. // Do stuff on a ThreadPool thread now! await MyForm.Dispatcher.SwitchTo(); // Switch to the UI thread. // Do stuff on the UI thread now! } </code></pre> <p>This is just one of the many wicked cool tricks you can do with the new <code>await</code> keyword.</p> <hr> <p><sup>1</sup>The only way you can actually inject the execution of code onto an existing thread is if the target is specifically designed to accept the injection in the form of a work item.</p> <p><sup>2</sup>You can see my answer <a href="https://stackoverflow.com/questions/5401567/how-to-implement-await-without-async-ctp/6712397#6712397">here</a> for one such attempt at mimicking the <code>await</code> keyword with iterators. The <a href="http://developer.mindtouch.com/Dream" rel="nofollow noreferrer">MindTouch Dream</a> framework is another, probably better, variation. The point is that it should be possible to cause the thread switching with some ingenious hacking.</p>
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    1. COFascinating! I will definitely have to do some more research on `await` and the Async CTP. I admit I didn't quite get what `await` was all about when I read about it a while back.
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    2. COWow; that's slick.
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