In this post, you can learn how a small change in the ASP.NET Core 3.0 WebHost makes it easier to run asynchronous tasks on app startup using IHostedService.

Task is the original and most well known API, since it shipped with the TPL, but it means that an object allocation is necessary even for scenarios where it turns out that it was already available, i.e. awaiter.IsCompleted returned true. The ValueTask value-type (struct) acts as a hybrid result that can represent an already completed result without allocating or an incomplete pending operation.

A very common thing to first try out when you encounter asynchronous principles in .NET is to simply mark your method with the async keyword.