32.8. Building an ASP.NET Web Page using Code Files
While the single file code model can be helpful at times, the default approach taken by Visual Studio 2010 (when creating a new web project) is to make use of a technique known as code-behind, which allows you to separate your programming code from your HTML presentation logic using two distinct files. This model works quite well when your pages contain a significant amount of code or when multiple developers are working on the same website. The code-behind model offers other benefits as well:
Because code-behind pages offer a clean separation of HTML markup and code, it is possible to have designers working on the markup while programmers author the C# code.
Code is not exposed to page designers ...
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