How Applicatoin Domain Created in ASP.Net

In a completed Web application, the executable portion of the Web form is stored in an assembly (.dll) that
runs on the server under the control of the ASP.NET worker process (asp_wp.exe), which runs in conjunction
with IIS. The content portion of the Web form resides in a content directory of the Web server,

 

asp_wp.exe create the application domain for the web application.