If the website is running on IIS on the same machine then you can attach the debugger to the IIS process. You do this by click on "Debug" then "Attach to process...". Sort the processes in descending order and find the process named "w3wp.exe". Then click the "Attach" button. If you don't see the process then view the site in a browser to allow IIS to start the process.
If the website is running on a different server then you can do the same but you need to run the remote debugging tool (MSVSMON). This means you will need to have Visual Studio installed on the webserver. Run MSVSMON and be sure the firewall doesn't block the connection. Now you click "Debug" then "Attach to process...". Enter the server name that was displaed on MSMON's debug window in the qualifier textbox. If everything is setup properly you will see the remote servers process list. Then you can connect to the "w3wp.exe" process.
These are two ways to debug web applications using Visual Studios and IIS.
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