If the DLL is another .NET assembly then just add a reference and use the functionallity.
If the DLL is COM compliant, just create a managed wrapper and add THAT as a reference.
If the DLL is a C++ (non-COM) DLL, then you can not (effectively )import "entire classes". The closest you can come is to create a .NET class which acts as a wrapper to the individual functions. This will give you a decent class facade.
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