title: Visual Studio C# Project Reference not working
body: <p>I created a solution in VS with two projects, one "Core" is a class library project, the other is my app project. I added a class NumberUtil (uses namespace Core.Util) and want to reference it in the app project so I choose r-click, add ref... pick Projects and add my Core project as a reference. The ref to Core appears under References in the project explorer but if I try to use the NumberUtil in a class in my app project it can't find it.</p>
  
  <p>Anyone know what I'm doing wrong here? I'm not new to programming but new to VS and C#.</p>