Screen capture via DirectX in Windows 10

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Windows

DirectX

screen

capture

So my problem is:
I have Windows 10 with Visual Studio 2015 Community; I want to capture a section of the screen from a Direct3D app., in real-time (this one is very important, it _must be_ real-time).... So I found this article: Very fast screen capture using DirectX in C#[^], which I could use as a base for my project, BUT there seems to be no way to add DirectX references to the C# project I have created in the aforementioned environment.

Any help would be appreciated!