Attaching to web server process starts asp.net development server

I am getting the same problem as this:

Debugging w/ Attach to Process Starts ASP.NET Dev Server

Every time I attach to the web server, I get another asp.net development server, eventually ending up with more and more.

However I don't see the option described in my Properties page. I have Visual Studio 2010. All I have in 开发者_JS百科the Properties is "Full Path" and "Opened URL".

EDIT: Note: they all have different port numbers

You created the application as a web site. If you create a new project (vs. web site), you will get the Project properties page that is described in the SO question you referenced.