PostSharp is a tool that can reduce the number of lines of code and improve its logical decoupling. Therefore its helps you delivering higher stability, cleaner design, and cheaper source code maintenance. PostSharp makes more with less code. How? Have you already implemented things like transaction management, logging, caching, or security? In each method, you had to write a same dozen of lines of code, right? With PostSharp, you can encapsulate these aspects as custom attributes. You can make your own custom attributes that will really add new behaviors to your code! This is sometimes called aspect-oriented programming (AOP) or policy injection.