.NET Framework versions

.NET Framework 2.0

•  64bit support
• Generics
• Anonymous Methods
• partial Class 
• Nulllable type
• new API gives a fine control on the behavior of the runtime with regards to multithreading, memory allocation, assembly loading and more
• new personalization feature for asp.net like themes,skin and web parts
• .NET Micro Framework
• Language support for generic built directly into the .NET CLR
• ADO.NET
• support for user defined type
• xml data type
• large value type
• snapshot isolation
• new attribute that allow application to support  multiple active result set(MARS) with sql server 2005
• ASP.NET
• Authenticated stream
• COM interop service enhancement
• Generic and collections
• Manifest based activation
• .NET Framework remoting

.NET Framework 3.0

• Framework2.0+WCF+WPF +WF
• It is called as WinFX, includes a new set of managed code API that are an integral part of window vista and windows server 2008 OS
• Wpf formaly called Avalon; a service-oriented messaging system which allows programs to interoperate locally or remotely similar to web services
• WWF allows for building of task automation and integrated transactions using workflows
•         windows cardspace, formerly called infoCard; a software component which securely store a person’s digital identities and provides a unified interface for choosing the identity for a particular transaction

       
  .NET Framework 3.5

• most dominant change is the addition of LINQ
• implements LINQ evolution in language
• addin system 
• p2p base class
• Active directory – asp.NET ajax
• anonymous types with static type inference
• paging support for ADO.NET
• ADO.NET synchronization API to synchronize local caches and server side datastores
•  asynchronous network I/O API
• support for HTTP pipelining and syndication feeds
• new system.codeDom namespace

 .NET Framework 4.0

• Parallel Extensions to improve support for parallel computing, which target multi-core or distributed systems
• New Visual Basic .NET and C# language features, such as implicit line continuations, dynamic dispatch, named parameters, and optional parameters
• Support for Code Contracts
• Inclusion of new types to work with arbitrary-precision arithmetic (System.Numerics.BigInteger) and complex numbers (System.Numerics.Complex)
• Introduce Common Language Runtime (CLR) 4.0

.NET Framework 4.5

• .net for windows store app
• Portable class library
• Managed Extensible Framework
• Asynchronous File Operations
• Parallel computing