Hi,
When I use criteria.list,it return IList<T> object,but I want to use a List<>,so that I can use functions like Find,FindAll,how should I go about it? How to convert Ilist into List,thanks

You can just create a new List<T> and pass in the IList into the constructor.

Heck, just make the function call in the constructor;

List<T> myList = new List<T>(criteria.List());