Passing data from one controller to another in ASP.NET MVC

At times you need to pass data from an action method belonging to one controller to an action method belonging to another controller. There are three ways to accomplish this task. They are - Pass data as query string, pass data in TempData, and pass data as route parameters. Let's quickly see how each of these three approaches work.

http://www.binaryintellect.net/articles/8e64d05b-ab2e-45f6-b7f5-b8a90168915e.aspx