... System.UIntPtr, 81 System.Numerics.Complex, 81 tail recursion, 81 tuple, 80 81 Observable collection refactoring, 85 Path.Combine( ), 82 profiling, 76 registry access changes, 82 83 security ... ExtendedProtection, 87 HttpWebRequest, 85 IPv6 Support, 85 SMTP client, 86 System.Device.Location, 87 TCPListener support for NAT transversal, 86 WebRequest, 86 new ASP .NET, 68 improved client profile, ... specifying Framework, 68 VB .NET command-line compiler, 69 new types BigInteger, 78 ISet<T> Interface, 80 Lazy<T>, 79 memory mapping files, 79 80 SortedSet<T>, 80 System.IntPtr...