Ever need to perform a unit test on and want to timeout while waiting for an event? Doing a quick google search for, “C# unit test timeout waiting for event” yields interesting mixed results. Here are a few different methods for completing such a task. Method 1 – Task.WhenAny The following uses the System.Threadding.Task.WhenAny method wrapped inside of our async method, WaitUntil(..). Th Method 2 – Synchronous ManualResetEvent Slightly different implementation without the use of Tasks. Method 3 – TaskCompletionSource Method 4 – Task.WhenAny Asyncronyously awaiting Task.WhenAny allows you to provide a delay as you can see below.