title: Could not find System.Runtime 4.1.0.0 when running ASP.NET web application
body: <p>I've created a Portable Class Library with the following projects.json</p>
  
  <pre><code>{
    "supports": {},
    "dependencies": {
      "Microsoft.CSharp": "4.0.1",
      "Microsoft.NETCore.Portable.Compatibility": "1.0.1",
      "NETStandard.Library": "1.6.0",
      "System.Runtime.Serialization.Primitives": "4.1.1",
      "System.Runtime": "4.1.0"
    },
    "frameworks": {
      "net451": {},
      "netstandard1.5": {}
    }
  }
  </code></pre>
  
  <p>However, when referencing this from an ASP.NET application (not ASP.NET Core), I get the following runtime exception:</p>
  
  <pre><code>Could not load file or assembly 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
  </code></pre>
  
  <p>If I reference it from a console application it runs without issues.</p>
  
  <p>Any ideas?</p>
  
  <p><strong>Edit</strong></p>
  
  <p>Found a solution here: <a href="https://stackoverflow.com/a/37639003/691045">https://stackoverflow.com/a/37639003/691045</a></p>