Visual Studio Editor does not underline errors anymore

Question

My Visual Studio (2008) Editor has stopped to underline Errors (this nifty wavy red lines). I can\'t really tell when, but it can be related to the installation of .Net Fram

Answer 1

Unloading and loading same project again from the solution does the trick. Just right click on the project and click "Unload Project". Once unloaded, again right click the same project and click "Reload Project". Error highlighting will return.