Microsoft's .NET development platform is taking the Windows development world by storm—for many good reasons. One of the biggest benefits of using .NET for desktop and Office applications is the code takes full advantage of the robust code access security (CAS), which uses the characteristics of the assembly to determine which permissions it has on the local machine. With Microsoft's Visual Studio Tools for Office 2003 (VSTO), you can fully tap into CAS. However, if you go in blindly, you'll encounter nothing but grief. In this article, I cover the intricacies of CAS as it applies to VSTO. It's a great way to explore how CAS provides better protection for users and protected resources while learning about the compromises Microsoft's VSTO team had to make to build a bridge between COM-based Office and .NET.
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