Generic Interface Question (.net 4.0)

[Wolfgang Von Steinberg]

Hello

I am using .net 4.0

I have :

IPersistor<T>

and

class CausePersistor implementing IPersistor<Cause>
class PersonPersistor implementing IPersistor<Person>

now, how can I have something like :

IPersistor persistor; where I could assign an object that implements
either IPersistor<Cause> , IPersistor<Person> ?

In other words what is the abstraction to be used for IPersistor<object> ?

I already tried

 IPersistor<object> persistor = new CausePersistor(); but this doesn't
compile.

Thank you

WVS