In C# 4.0, is it possible to derive a class from a generic type parameter?

No, this is not possible. For example, take a type that is declared sealed . You can't inherit from that class, and there is no constraint to limit to non sealed types, ergo trying to inherit from it via a generic parameter is impossible.

Generic types in C# are not C++ templates; remember, a generic type must work for all possible type arguments. A template need only work for the constructions you actually make.

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