Library file for c# dot net
<p>I'm a relatively new c#.net programmer and need some advice on adding a Library file to a c# project.</p>

<p>This project is not done in proper C# fashion and I realize that, but am not looking to solve that today.</p>

<p>I have 3 .aspx pages and each has a corresponding .cs file set up as a code behind.  That all works fine.</p>

<p>Each of the .cs files has several functions that identical.  I'd like to move those common functions into a common .cs file that is used by all of the .aspx pages (or the .cs files if that is how to do it) while keeping the unique code behind files for functions unique to that aspx/cs pair.</p>

<p>Once the common file is created (it already is), How do I reference that file this as simply as possible?</p>
