Developing chat Module [closed]

Answer 1

You might want to have a look at SignalR, an async signaling library for .NET which would be perfect for a chat-application:

https://github.com/SignalR/SignalR

Scott Hanselman has a good example on his blog:

http://www.hanselman.com/blog/AsynchronousScalableWebApplicationsWithRealtimePersistentLongrunningConnectionsWithSignalR.aspx

Answer 2

When a user sends a message, an AJAX request will be made to your server and you'll probably save the posted message to a database. You can also have an ajax request made every X seconds that checks for any newly posted messages on the server, and if there are any, it shows them to the user.

Alternatively you can use a technology called Comet, through which your server can 'push' a response to the clients to notify them whenever a new message has been posted.

Answer 3

You should research long polling and web sockets. These allow your clients to have updates pushed to them more effectively. You could poll the server every x seconds, but it would be wasteful of resources.