Refresh Local Cache command missing in Visual Studio

These are the few top solutions for getting Visual Studio 2012 intellisense back on track try them one by one, hope one of them will solve the problem:

When the problem occurs next time follow these: start from #1 and Move to next when the earlier one doesn't work for you

1: Close all the tabs and open your file again. 

2: Clean the Build > Close the Solution > Restart Visual Studio > Open the Solution again

3: Goto: Edit > IntelliSense > Refresh Local Cache

4: Close Visual Studio 2017 and delete this folder: %AppData%\Microsoft\VisualStudio\17.0\ReflectedSchemas

5: Goto: TOOLS > Import and Export Settings > Reset all settings

6: Delete .suo file in the project folder.