Why the 'Insert DevExpress MVC Extension' option can be missing in the DevExpress section of Visual Studio's main menu and in the context menu in an MVC 5 project

• Sep 02, 2023

Error Description

This issue can occur if some packages are installed incorrectly in an MVC 5 project.

Solution

Make sure that your project contains references to the following assemblies:

• System.Web.Helpers
• System.Web.Mvc
• System.Web.WebPages

If not, perform the following steps:

1. Uninstall the Microsoft.ASPNet.Mvc and Microsoft.ASPNet.WebPages packages.

   You can use the NuGet console for this purpose:

   Uninstall-Package Microsoft.ASPNet.Mvc -Version 5.2.3  
   Uninstall-Package Microsoft.ASPNet.WebPages -Version 3.2.3  
   

2. Install Microsoft.ASPNet.Mvc.

   Install-Package Microsoft.ASPNet.Mvc -Version 5.2.3
   

3. Restart Visual Studio.