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The GitHub Copilot app modernization
To upgrade ASP.NET Framework applications (MVC, Web API, and Web Forms) to ASP.NET Core, use the GitHub Copilot app modernization Visual Studio extension.
The GitHub Copilot app modernization agent is a Visual Studio extension that leverages AI to simplify the process of upgrading legacy .NET applications. By integrating with GitHub Copilot Chat, this tool analyzes your solution to generate upgrade plans and assists in rewriting code to support ASP.NET Core. It streamlines the migration workflow by reducing manual effort, identifying dependencies, and providing interactive, automated guidance for modernizing your codebase. To learn how to upgrade your ASP.NET apps using the recommended tooling, see How to upgrade a .NET app with GitHub Copilot app modernization.
If your .NET Framework project has supporting libraries in the solution that are required, they should be upgraded to .NET Standard 2.0, if possible. For more information, see Upgrade supporting libraries.
Important
.NET Upgrade Assistant is officially deprecated. Use the GitHub Copilot app modernization chat agent instead, which is included with Visual Studio 2026 and Visual Studio 2022 17.14.16 or later. This agent analyzes your projects and dependencies, produces a step-by-step migration plan with targeted recommendations and automated code fixes, and commits each change so you can validate or roll back. It automates common porting tasks—updating project files, replacing deprecated APIs, and resolving build issues—so you can modernize faster with less manual effort.
See also
Collaborate with us on GitHub
The source for this content can be found on GitHub, where you can also create and review issues and pull requests. For more information, see our contributor guide.
ASP.NET Core