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.
Answers:
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Method 1
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.
Method 2
You need to add a wildcard DNS mapping that maps *.example.com to your webserver, and a wildcard hostname mapping telling IIS to send all subdomains to your ASP.Net website.
You can then check Request.Hostname in server-side code and use the appropriate content (or error message)
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0