What is the difference between await Task and Task.Result?

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I wont be wrong if I think that await will release the calling thread but Task.Result will block it, would it be right?

Generally, yes. await task; will “yield” the current thread. task.Result will block the current thread. await is an asynchronous wait; Result is a blocking wait.

There’s another more minor difference: if the task completes in a faulted state (i.e., with an exception), then await will (re-)raise that exception as-is, but Result will wrap the exception in an AggregateException.

As a side note, avoid Task.Factory.StartNew. It’s almost never the correct method to use. If you need to execute work on a background thread, prefer Task.Run.

Both Result and StartNew are appropriate if you are doing dynamic task parallelism; otherwise, they should be avoided. Neither is appropriate if you are doing asynchronous programming.

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