title: Visual studio 2013 + .Net 4.5.1 + Edit and continue 64 bit: not working
body: <p>Supposedly vs 2013 added support for edit and continue 64 bit (see <a href="http://blogs.msdn.com/b/visualstudioalm/archive/2013/06/26/debugging-support-for-64-bit-edit-and-continue-in-visual-studio-2013.aspx" rel="noreferrer">http://blogs.msdn.com/b/visualstudioalm/archive/2013/06/26/debugging-support-for-64-bit-edit-and-continue-in-visual-studio-2013.aspx</a>). </p>
  
  <p>However I can't get it working.</p>
  
  <p>After going to the properties of my .net 4.5.1 asp.net mvc web application project, and checking the "Enable Edit and Continue" checkbox, I can now edit the code while on a breakpoint.</p>
  
  <p>The problem is that after saving and trying to keep on stepping trough, I get an error dialog saying: </p>
  
  <blockquote>
    <p>Edits were made which cannot be compiled. Execution cannot continue
    until compile errors are fixed</p>
  </blockquote>
  
  <p>In the error list window, those 2 errors always show:</p>
  
  <blockquote>
    <p>The type 'System.IEquatable`1' is defined in an assembly that is
    not referenced. You must add a reference to assembly 'System.Runtime,
    Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.   </p>
    
    <p>The type 'System.ValueType' is defined in an assembly that is not
    referenced. You must add a reference to assembly 'System.Runtime,
    Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.</p>
  </blockquote>
  
  <p>It's really weird error message right? However insignificant my change is, I always get the same error.</p>
  
  <p>note: I run windows 7 / vs 2013 ultimate and my project is set up to use IIS Express in the project properties.</p>