How do I use VaryByParam with multiple parameters?

Question

In ASP.NET MVC2 I use OutputCache and the VaryByParam attribute. I got it working fine with a single parameter, but what is the correct syntax when

Answer 1

You can use * for all parameters or a semi-colon separated list (VaryByParam = "customerId;languageId").

You can also use none if you didn't want it to cache different versions....

Here's a nice write up specifically for MVC.