title: Keyword not supported: "data source" initializing Entity Framework Context
body: <p>I'm initializing Entity Framework Object context, and this gives me the keyword not supported error:</p>
  
  <p><code>metadata=res://*/MainDB.csdl|res://*/MainDB.ssdl|res://*/MainDB.msl;provider=System.Data.SqlClient;provider connection string=&amp;quot;Data Source=.\SQLEXPRESS;AttachDbFilename=D:\Workspace\vs\Leftouch\Leftouch.Web\Data\Leftouch.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True;App=EntityFramework&amp;quot;</code></p>
  
  <p>I took the connection string directly from web.config which was working, and modified only the path to the file (which I set dynamically), and instead of using the default value, used this connection string explicitly. What could cause this error?</p>