.NET2.0->3.0->3.5

      .NET 2.0 = CLR +BCL+ C#(vb.net) + Win Form + Web Form
　　.NET 3.0 = .NET 2.0 + WCF + WPF + WF + WCS
　　.NET 3.5 = .NET 3.0 + ASP.NET AJAX +Silverlight+LINQ