[c#] Effectively use async/await with ASP.NET Web API

You are not leveraging async / await effectively because the request thread will be blocked while executing the synchronous method ReturnAllCountries()

The thread that is assigned to handle a request will be idly waiting while ReturnAllCountries() does it's work.

If you can implement ReturnAllCountries() to be asynchronous, then you would see scalability benefits. This is because the thread could be released back to the .NET thread pool to handle another request, while ReturnAllCountries() is executing. This would allow your service to have higher throughput, by utilizing threads more efficiently.

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