title: unable to evaluate expression whilst debugging
body: <p>When debugging asp.net code (running against IIS, and using Visual studio 2013) and in a breakpoint and trying to evaluate a variable using quick watch i quite often get "unable to evaluate expression". </p>
  
  <p>deleting the .suo from the asp.net project folder seems to resolve the issue (After reloading the solution)</p>
  
  <p>Is this a recognised bug? getting this a lot now in Visual studio 2013 on more than one machine. </p>