Open Application in Visual Studio, Click on Build > Publish Web Site.
Browse to where you want to save published DLLs,Files and other aspx pages. (TestWebSite)
Copy TestWebSite folder inside C:\inetpub/wwwroot directory.
Click on Start Menu > Run > INETMGR to open IIS manager.
Click on sites > Default Web Site.
Right Click on folder we copied and Select Convert To Application.
Create new pool by right clicking on Application pools.
Go to Advance settings
Hope this helps.