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Sometime ago I asked this question and I was told that the entry has to be made in DNS etc. I was not sure whether all this is really required or not. The kind of feature that I am looking for is shown in the screenshot below:
As you can see blogger lets the user choose the subdomain for his blog. How can we achieve this? I am basically developing in asp.net C#. How can I allow my users to choose subdomains like this once I have my top level domain. Currently I am developing on localhost.
Use a wild card domain in IIS so it traps every request to the top level domain and under.
In asp.net: Create an HttpModule… this will run for every request and you can check the domain name, etc and pull in user information based on the sub-domain. An example httpmodule can be found at URL Rewriting in ASP.NET via HttpModule.
In asp.net mvc: Create a custom RouteHandler (custom based on interface IRouteHandler). Look at RouteHandler vs ControllerFactory question for an example.