How to Debug a code from SharePoint site?

Most of the times we face the problem while developing that how to debug the code written to create a web part or event handler. Here is the solution for it:

1. Refresh your site once and then in Visual Studio Press ALT + D + P
2. Make sure that the debugging mode is 'Managed Code' and not the native which is default value.
3. You will see there will be a process by the name w3wp.exe . Select it and press attach.
4. Now raise the event through the sharepoint site.