Best way to create an instance of run-time determined type [duplicate]

Answer 1

The problem here is you can never know the type of DerivedClass at compile time.

You can however do this type of thing:

BaseClass obj = new DerivedClass();

This is implemented like this:

BaseClass obj = (BaseClass)Activator.CreateInstance(this.GetType());

This call will fail if the DerivedClass has no parameterless constructors though.