title: C#: Can't manually change string value in VS debugger
body: <p>I have a breakpoint set in a method that receives a string parameter. I'm trying to change the value of that parameter, by editing it in the Locals window (or the mouseover popup), but it immediately snaps back to the original value.</p>
  
  <p>Could this be a configuration or code pattern issue? I'm certain I've changed string values in this way before.</p>