如何从ASP.NET MVC中的基本控制器连接公共代码

My ASP.NET MVC application is a small part of a bigger ColdFusion app that is going to be soon replaced completely. I'm passing some parameters from ColdFusion part through cookies and need to check for this information before I run every action. In case if the information is missing I need to redirect to the parent site. What is the best place to put this functionality and how to call it uniformally?My ASP.NET MVC application is a small part of a