Global.asax file is missing on my Asp.Net Empty Web application project

You can also add it from project i.e. right click the project and add new item there you can find or search for Global Application Class template and add it.It's done.

You can add a new file to the project of type Global Application Class

File -> New -> File -> Global Application Class

Alternately, you can create a new temporary project, which should generate a Global.asax file. Then just copy/paste that into your project.