The type or namespace name ‘IHttpActionResult’ could not be found


This short article shows you how to resolve the error “The type or namespace name ‘IHttpActionResult’ could not be found”.


If you have an ASP.NET is not create using Web API temp and you include the Web API controller in your project then you might get the following error:


Severity Code Description Project File Line Source
Error CS0246 The type or namespace name ‘IHttpActionResult’ could not be found (are you missing a using directive or an assembly reference?) WebApplication1 C:\VCShapeTemp\WebApplication1\WebApplication1\Controllers\TriviaController.cs 38 IntelliSense


You go to pull down menu choose Tools -> NuGet Package Manager -> Manage NuGet Package for Soluttion…

Search for webapi then pick the newest, I use 5.2.3.




About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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