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Asked: 2026-06-14T03:57:43+00:00

I checked the System.Web.Mvc.AsyncController in MVC 4.0, it has the comment Provided for backward

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I checked the System.Web.Mvc.AsyncController in MVC 4.0, it has the comment “Provided for backward compatibility with ASP.NET MVC 3.” does this mean there is a new implementation of async controller in MVC 4? what’s the correct way in MVC 4.0 enable async a controller in order to put the I/O intense operations in other thread pool other than IIS request thread pool?

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  1. Editorial Team

    Starting from ASP.NET MVC 4, you can now use the System.Web.Mvc.Controller class as the base class and leverage the TAP (Task-based Asynchronous Pattern):

    public async Task<ViewResult> Index() { 

     return View(await GetThingsAsync());
}

    Note that you don’t have to use async and await keywords which come with C# 5.0 but they make asynchronous programming much, much easier and more maintainable.

    Have a look at the following articles:

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