C# Generics syntax help

Question

I can't figure out the correct sytax for the following:

public interface IRepository<T,E> where T E: class

Looked a lot online, but articles don't seem to cover two classes.

Thank you

Answer 1

From the "Constraining Multiple Parameters" section of Constraints on Type Parameters (MSDN):

public interface IRepository<T, E> 
    where T : class
    where E : class

Answer 2

public interface IRepository<T,E> 
where T: class
where E: class