Reinstall Nuget Package Manager in Visual Studio 2019

Question

I am facing a problem with my project.

The type or namespace name \'System\' could not be found (are you missing a using directive or an assembly ref

Answer 1

Such nuget restore issues can normally fix by deleting the obj folder where files like project.assets.json, projectname.csproj.nuget.g.targets, projectname.csproj.nuget.g.props, projectname.csproj.nuget.dgspec.json and projectnamecsproj.nuget.cache.

If this still doesn't fix it, delete the hidden .vs folder inside the solution, where Visual Studio stores the user settings for the project.