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1

What are the differences between WCF using .NET 3.0 versus .NET 3.5? I need to understand what has improved between the .NET versions.

+6  A: 

in 3.5 you get

  • WCF and WF Integration—Workflow Services
  • Durable Services
  • WCF Web Programming Model
  • WCF Syndication
  • WCF and Partial Trust
  • WCF and ASP.NET AJAX Integration
  • Web Services Interoperability

see http://msdn.microsoft.com/en-us/library/bb332048.aspx for details

if you apply the .NET 3.5 SP1 you get

  • Significant scalability improvements (5-10x) in Web-hosted application scenarios
  • Support for using ADO.NET Entity Framework entities in WCF contracts
  • API usability improvements with DataContract Serializers, and with the UriTemplate and WCF web programming models
  • Enhanced TestClient support within VS 2008 SP1
  • New Hosting Wizard in VS 2008 SP1 for WCF Service Projects
  • Improved debugging support in partial trust scenarios
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