Why can't you just hit F5 on your Website project?
You will need to change its setting to:
Project Properties -> Start Options -> "Don't open a page. Wait for a
request from an external application."
Then hit F5. Visual Studio will run a "ASP.NET Development Server", which is
an analog to IIS but listens to a different port. Change your client to
connect to that port, and then you are free to debug your web app.

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http://www.rackaroo.com
> 1) I start my client Windows app
> 2) At a breakpoint I attach to the aspnet_wp.exe
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> Thanks,
> Ron