Identify the w3wp with attached Application Pool Information

Please follow the command below then you can get all lists of your SharePoint Web Application in command prompt.
Add below links in BATCH file (.bat) & Save it.
Then right click on "Run as Administrator" then you will get lists of SharePoint Web Application.

cd c:\windows\system32\inetsrv
appcmd list wp
PAUSE

Then check your Application Id and attach W3WP with same id in Visual Studio.