title: ASP.NET Core 3.1 project that is referencing a .NET 4.7.2 project in the same solution error 'System.Web.Configuration.WebConfigurationManager'
body: <p>I have an ASP.NET Core 3.1 project that is referencing a .NET 4.7.2 project in the same solution. It compiles without problems but at runtime I get an error:</p>
  
  <blockquote>
    <p>Could not load type 'System.Web.Configuration.WebConfigurationManager'.</p>
  </blockquote>
  
  <p>I have installed the <code>Microsoft.Windows.Compatibility</code> package in the ASP.NET Core project, but that did not help.</p>
  
  <p>Am I missing something or will this not work without some major refactoring of the .NET 4.7.2 project to not use that <code>System.Web.Configuration.WebConfigurationManager</code> namespace?</p>