Visual Studio Code issue

I forget to add 2 imports in the file

using System.Collections.Generic;

using Xamarin.Forms;

and my code may be builded normally from the command line,
but in IDE I can't use the Ctrl+click navigation and intellisense in that file,
so I may
1. close the IDE;
2. build the project from the command line;
3. re-open the IDE and look at the errors' list or if I can't see errors then
to open the files one by one where intellisense doesn't work and find where I missed the import (it may be marked with red lines or not marked at all) or have other errors.