title: Application settings error after changing target framework of project
body: <p>In my application I am using user settings as explained <a href="http://msdn.microsoft.com/en-us/library/aa730869%28v=vs.80%29.aspx" rel="noreferrer">here</a>.
  Then I realized that in VS 2010 I was using .NET 4.0 while only .NET 2.0 was sufficient.</p>
  
  <p>When I changed the framework and build the project, in my code whenever I access setting now, I get the following error:</p>
  
  <blockquote>
    <p>An error occurred creating the
    configuration section handler for
    userSettings/Vegi_Manager.Properties.Settings:
    Could not load file or assembly
    'System, Version=4.0.0.0,
    Culture=neutral,
    PublicKeyToken=b77a5c561934e089' or
    one of its dependencies. The system
    cannot find the file specified.
    (C:\Users\AKSHAY\AppData\Local\Microsoft\Vegi-Manager.vshost.exe_Url_44035dlkzpfaaauiqsd4nh3f0l0yq0tv\1.0.0.0\user.config
    line 5)</p>
  </blockquote>
  
  <p>It is for unknown reasons using version 4.0.
  Please suggest what should I do.</p>