SignalR is an asynchronous signaling library for ASP.NET that helps build real-time, multi-user web applications by making the web fabric appear stateful. It was invented in 2011 by David Fowler and Damien Edwards as a client and server library that provides messaging and abstraction over a persistent connection. SignalR requires .NET 4, ASP.NET or MVC, jQuery, and can be used to build applications like live auctions, sports sites, and chat rooms.

1. SignalR
Contextualizing Reverse Ajax in a
Postmodernized Web 3.0 Domain Space.

2. What is this and why do I care?
SignalR (github): An asynchronous signaling library for ASP.NET to help build
real-time, multi-user interactive web applications.
SignalR (Nuget): A client and server side library for ASP.NET that provides
messaging and an abstraction over a persistent connection.
Bottom line: A solution dealing with the stateless nature of the web =>
making the web fabric appear to behave in a stateful way.

3. History/Requirements
History
• Invented by David Fowler and Damien Edwards in August 2011
• Two part library – a server piece (C#, no VB.NET!) and a Javascript (jQuery) piece
• Specific to .NET Framework (there exist other solutions specific to PHP, Java)
• Depending on interest, may/may not be part of .NET 4.5
• Examples of usage: Auction sites, Sports sites, Chat room (Jabb R - http://jabbr.net/)
Requirements
• .NET 4 Framework (utilizes Task Programming Library)
• Must run in a ASP.NET or ASP.NET MVC project.
• jQuery dependency
• Download SignalR package from Nuget

4. Resources
• General Documentation: https://github.com/SignalR/SignalR/wiki
• http://github.com/signalR
• http://nuget.org/packages/SignalR
• Ayende, Part 1: http://ayende.com/blog/92161/reviewing-signalrndash-part-i
• Ayende, Part 2: http://ayende.com/blog/93185/reviewing-signalrndash-part-ii
• Scott Hanselman: http://bit.ly/qeJFyf
• Slide Deck example: http://bit.ly/tZUFWq