ASP.NET 4.5 New Features List

  • ASP.NET Framework and Runtime
    • HTTP Requests and Responses with  Asynchronously Reading and Writing  supports
    • HttpRequest handling Enhancements.
    • Asynchronously flushing support for response
    • giving Support to Task-Based and  await  Asynchronous  Handlers and Modules
    • Asynchronous HTTP modules enhancements
    • Asynchronous HTTP handlers  enhancements
    • ASP.NET Request Validation Enhancements.
    • Deferred ("lazy") request validation Enhancements.
    • unvalidated requests support
    • AntiXSS Library support
    • WebSockets Protocol Enhancements and support
    • Bundling and Minification support or enhancements.
    • Web Hosting  Performance Improvements for 
      • Key Performance Factors Enhancements.
      • Requirements for New Performance Features  Enhancements.
      • Sharing Common Assemblies  Enhancements.
      • Using multi-Core JIT compilation for faster startup  Enhancements.
      • Tuning garbage collection to optimize for memory  Enhancements.
      • Prefetching for web applications  Enhancements.
  • ASP.NET Web Forms
    • Strongly Typed Data Controls Enhancement
    • Model Binding New Features
      • Selecting data Feature
      • Value providers Feature
      • Filtering by values from a control Feature
    • HTML Encoded Data-Binding Expressions Enhancements
    • Unobtrusive Validation Enhancements.
    • HTML5 Supports for updates.
  • ASP.NET MVC 4 Supports and Enhancements.
  • ASP.NET Web Pages 2  Supports and Enhancements.
  • Visual Studio 11 Beta Enhancements.
    • Project Sharing Between Visual Studio 2010 and Visual Studio 11 Beta (Project Compatibility) Enhancement.
    • ASP.NET 4.5 Website Templates  Configuration Changes
    • IIS 7 for ASP.NET Routing  Native Support
    • HTML Editor Enhancements.
      • Smart Tasks  Enhancements.
      • WAI-ARIA support or Enhancements.
      • New HTML5 snippets Enhancements.
      • Extract to user control Enhancements.
      • IntelliSense for code nuggets in attributes  Enhancements.
      • Automatic renaming of matching tag when you rename an opening or closing tag  Enhancements.
      • Event handler generation  Enhancements.
      • Smart indent  Enhancements.
      • Auto-reduce statement completion  Enhancements.
    • JavaScript Editor Enhancements.
      • Code outlining  Enhancements.
      • Brace matching  Enhancements.
      • Go to Definition  Enhancements.
      • ECMAScript5 support and   Enhancements.
      • DOM IntelliSense Enhancements.
      • VSDOC signature overloads Enhancements.
      • Implicit references Enhancements.
    • CSS Editor Enhancements.
      • Auto-reduce statement completion Enhancements.
      • Hierarchical indentation Enhancements.
      • CSS hacks support and  Enhancements.
      • Vendor specific schemas (-moz-,-webkit) Enhancements.
      • Commenting and uncommenting support and  Enhancements.
      • Color picker Enhancements.
      • Snippets support
      • Custom regions Enhancements.
    • Page Inspector Enhancements.
    • Publishing Enhancements.
      • Publish profiles Enhancements.
      • ASP.NET precompilation and merge Enhancements.
  • IIS Express Enhancements.

For more information please see this link 
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