Vista - Create a proxy if i dynamically get a Type of contract.

I want to dynamically create a proxy. I have an assembly and a string
(e.g. "IService") of contract (interface) in this assembly.
I can get a variable of type Type of interface which is a contract for
a service.
Beacuse i get this at run-time, i can't use generic ChannelFactory
like this:

IServiceBase mProxy =
ChannelFactory<IService>.CreateChannel(lNetTcpBinding,
lEndpointAddress);

(IService inherit from IserviceBase)


My question is how can I dynamically create mProxy for that service?

Thanks.