How to get the cookie value in asp.net website

I am creating a cookie and storing the value of username after succesfull login. How can I access the cookie when the website is opened. If the cookie exist I want to fill the username text box from the cookie value. And how to decrypt the value to get the username. I am doing server side validation by getting the userdetails from the database. I am using vs 2010 with c#

notify client from server

If I have an asp.net application, and I want to notify the user when something changes on the server, how do I do this.
The same thing with a silverlight client. For the silverlight client is there some form of subscribing to an event on the server from the silverlight client?

Using an IHttpAsyncHandler to call a WebService Asynchronously

Here’s the basic setup. We have an ASP.Net WebForms application with a page that has a Flash application that needs to access an external Web Service. Due to (security I presume) limitations in Flash (don’t ask me, I’m not a Flash expert at all), we can’t connect to the Web Service directly from Flash. The work around is to create a proxy in ASP.Net that the Flash application will call, which will in turn call the WebService and forward the results back to the Flash application.

Dynamically Added Event Handler Not Firing

Here is a quick code snippet, that doesn’t seem to work at all for me. I’m reading from a file to create a list of radio buttons. The problem is that when one of the radio buttons is clicked the Event Handler I have set up in the code doesn’t fire. I have tested it over and over in debug mode with line breaks… all with no luck. Am I missing something obvious here????