OK what do you want to do here? Fire off something into a background task, and wait for it to finish before continuing?

If that's the case you probably don't need to go as low level as the Thread class, there's a few other options, including BackgroundWorker, Task, Plinq, Async, Lions and Tigers oh may!

Personally I like Task, but then all my use cases are fire and forget. You can also chain tasks, tor example

var startTask = new Task(() => SomeMethodSomewhere());

var nextTask = startTask.ContinueWith((t) => SomethingElseThatIsRunAfter());

startTask.Start();

Task.WaitAll() then gives you a way to wait for completion.