I used ReSharper in order to do some tasks and after uninstalled it because it confused me (all the highlights ad the quick links.. I prefer the default behaveior of visual studio).
After I uninstalled it - compilation errors that used to be underlined with red line now has no underline at all.
How can I reset visual studio with the defauld behaveior?
Try Tools > Import/Export Settings > Reset All Settings
The ReSharper team has accounted for this use case for the last few versions (Wanting to run VS without R#) So for next time there's an easier way: Tools > Options > ReSharper > Suspend
Info From the dialog:
Suspends ReSharper.
All of the ReSharper actions will be unavailable, the background analyses will not be running, the memory will be freed, and CPU consumption will cease.
This action is also available with Visual Studio commands ReSharper_Suspend and ReSharper_ToggleSuspended.
To restore ReSharper functionality, you will have to resume it manually in this dialog or with ReSharper_Resume
The ReSharper Options are on the same property dialog and you can turn off the stuff that annoys you.
来源：https://stackoverflow.com/questions/6820049/resharper-confused-my-visual-studio-reset-visual-studio-with-defaults