Fixed issue with Stream not closed properly in .NET 3.5

Solution was provided by a developer on the forums at http://community.constantcontact.com/t5/Getting-Started-with-API-s/System-Enum-does-not-contain-a-definition-for-TryParse/m-p/83011/highlight/false#M1900
Merge pull request #12 from kramerg/master

Fixed issue with Stream not closed properly in .NET 3.5