Referencing another project in Visual Studio

Hello everyone,

My problem is I have many projects in Visual Studio and I added Unity project to the solution.
In that Unity project I wanted to use another projects from the solution but I cannot add reference to them in normal 'Visual studio' way.

I was looking for a long time for solution of that but I couldn't find anything reasonable (working for me).
What I realised is that I should add my DLL files to the 'Assets' folder but what next ?

Adding this DLL files to unity project doesn't make that visual studio or any other editor is detecting these DLLs and with every try to run program I got error about missing assembly reference.

I am new to Unity but I have to say that looking for information about any technical problem is really terrible. If there are somhere any tutorials, they are usually out of date (like created 5 years ago).

I am suprised because I guess that when you are developing a game you usually have more than one project in solution and why referencing other project is so problematic ?

What is the simplest way to reference another project in the solution ?

 

Is it really necessary to reference another project from your Unity project...?

Sorry if I'm not getting what you're saying-

 

My question is: What is the simplest way to reference another project in the solution ?

 

3 years late but I am also having issues finding resources or documentation on how to properly reference other projects (perhaps my google skills are weak).

Usecase: I am building an MMO and I have two main projects: Client (Unity) & Server (C# app). At some point both of these solutions need to reference the same entity classes and business logic - these would be in their own project. I could copy & paste (duplicate) the code but this is not a good solutions.

Thoughts?

Thanks!

EDIT: It looks like one way to do it is by creating a sub git inside your assets folder:
https://answers.unity.com/questions/16908/how-to-share-c-source-between-unity-projects.html