Unfortunately no. Generics are only supported on version 2.0 and above of the Microsoft .NET framework. Code that relies on generics must run on version 2.0 of the CLR. Because of the way the CLR version unification works, a run-time process can only load a single version of the CLR. Consequently, a process that loaded version 1.1 of the CLR cannot use generic types. If you must use generic types from .NET 1.1, you can use the following work-around: First, wrap the generic types with object-based types (at the expense of course of the benefits of using generics). Next, load the wrapper classes in a separate process which loads version 2.0 of the CLR, and provide remote access to the wrapper classes to legacy clients in process that use version 1.1 of the CLR. For remote communication you can use any number of cross-process communication mechanisms, such as Remoting, Enterprise Services, sockets, etc.