title: Where should I put custom classes in ASP.NET Core project
body: <p>I have some utility functions and want to create classes named Utility for these functions, so that I can use these class function in more than one controllers.</p>
  
  <p>So where can I put these class in my folder structure in <code>ASP.NET Core 1.1</code> project, and how can I access then?</p>