title: How to define environment variables in a VS solution and use them in csproj files?
body: <p>I would like to define user environment variables in a Visual Studio solution. Then I would like to use them in the project files. For example:</p>
  
  <pre><code>&lt;ProjectReference Include="$(MyUserVar)\MyProject.csproj"&gt;
  </code></pre>
  
  <p>Is it possible?</p>