The "The name 'X' does not exist in the current context" error is a fairly common compiler error, but most of the time VS has access to all the information the user will need to resolve the problem.
This suggestion is to provide a context menu option on location for those errors that provide the user ways to resolve it, if VS can find any.
For example: The name 'MessageBox' does not exist in the current context.
'MessageBox' is an obvious example of a class defined in one of Microsoft's common namespaces. If I right-click on this error, it would save me substantial time if I could select "Resolve with 'using System.Windows.Forms'" from the context menu.