I am starting a new coding job with a new client.

The problem I am having is that a lot of issues with namespaces that can not be found or maybe missing directives or an assembly reference. This, I think, is a common thing. So I am wondering where I can download a free DLL from Microsoft that will do the trick and get me to compile my code. The class the code is using that the compiler does not like is "GeoPoint".

A quick search online offered using nuget to install the package Azure.Core.

So, how do I do this? I am using Microsoft Visual Studio Community 2019. I am looking for some direction. Please advise.