title: Scripts contained in the package have compilation errors
body: <p>In my developer environment(Visual Studio/SSDT 2013) I created a ssis-package with a script-task.</p>
  
  <p>But when I try to open the package on the production environment(Visual Studio 2010/SSDT 2010) I get "compilation errors" on the script-task. I haven't made any changes in the code, I also tried to replicate the original on a new script-task, inside of SSDT 2012, with copy-paste. Just needed to change the namespace, and add a new Web Reference(which is needed to get data from the web-api), based on the original from the developer environment.</p>
  
  <p>Also when I build the script it succeeds, but gives me a compilation error when I save and quit and press "OK".</p>
  
  <p>Why is that? Does "C# 2010"´really differ that much from "C# 2012" so it could be a difference in code/library?</p>
  
  <p>Thanks in advance!</p>