Chat application with Windows Azure Service Bus backend.

I wrote this simple chat application to learn more about asynchronous (async/await) and Azure Service Bus programming.

Cloud icon by Emey87 (http://emey87.deviantart.com/) released under CC BY-ND 3.0 (http://creativecommons.org/licenses/by-nd/3.0/).

• Visual Studio 2012 .Net 4.5
• Windows Azure Service Bus SDK (Microsoft.ServiceBus.dll): http://www.windowsazure.com/en-us/develop/downloads/
• Windows Azure account: http://www.windowsazure.com/en-us/pricing/free-trial/
• A Service Bus namespace configured: http://www.windowsazure.com/en-us/develop/net/how-to-guides/service-bus-topics/

• Chat messages from all clients are posted to the same topic.
• By letting all clients subscribe to the same topic, they receive all messages from all clients.

• The connection string is read from App.config
• The topic "CumulusChatTopic" is created if it does not exist.
• A new subscription is created using a GUID as name
• A TopicClient is created for sending messages
• The synchronous (blocking) method TopicClient.Send is used for sending the chat message.
• A SubscriptionClient is created for receiving messages
• An infinite loop is started for receiving messages, by using asynchronous await the application is not blocked - the GUI is still responsive.

• Copy your connections string from Azure Management Portal
• Paste into App.config
• Start two instances of CumulusChat and start talking to your self =)