Do asynchronous operations in ASP.NET MVC use a thread from ThreadPool on .NET 4

Question

After this question, it makes me comfortable when using async operations in ASP.NET MVC. So, I wrote two blog posts on that:

• My Take on

Answer 1

Yes, they use a thread from the thread pool. There is actually a pretty excellent guide from MSDN that will tackle all of your questions and more. I have found it to be quite useful in the past. Check it out!

http://msdn.microsoft.com/en-us/library/ee728598.aspx

Meanwhile, the comments + suggestions that you hear about asynchronous code should be taken with a grain of salt. For starters, just making something async doesn't necessarily make it scale better, and in some cases can make your application scale worse. The other comment you posted about "a huge volume of traffic..." is also only correct in certain contexts. It really depends on what your operations are doing, and how they interact with other parts of the system.

In short, lots of people have lots of opinions about async, but they may not be correct out of context. I'd say focus on your exact problems, and do basic performance testing to see what async controllers, etc. actually handle with your application.