Generation of Separate DLLs for each Code-behind file

You can generate separate DLLs for all code-behind files (.aspx.cs pages) of
your web application by following three simple steps.

1. Right click on Project in Solution Explorer and select ‘Publish Web Site’

2. Select first two checkboxes and provide the path

3.Click on OK

One of the need of these separate DLL is to perform Code Analysis (aka FxCop ) on these files in

order to measure the quality of the code.