Is it possible to use .NET libraries in Unity?

I am currently trying to setup multi-language support for my game. To do that, I am storing all of my language data in a csv file that I want to parse out into a ready-to-go array of text data that can be used by my game whenever text is going to show up. There is a third party library I got using NuGet called FileHelpers that can parse the csv file for me. Even though my IDE has properly imported the new library and is not complaining, Unity is giving me this error:

 error CS0246: The type or namespace name `FileHelpers' could not be found. Are you missing an assembly reference?

I am brand new to Unity and C#. Does Unity support this kind of workflow?