Many websites have two points of entry for each individual page – one with www and one without. It means that if other websites link to yours, they might link to the same page using two different addresses.
Retrieve Subdomain from a URL in C#
I had to come up with a method that retrieved the subdomain from the current web request on an ASP.NET website.
What is a Subdomain?
When you have yourself a pie, chances are you are not going to want to eat the whole thing yourself. Instead you will divide the pie into several pieces so that it is easier to manage and everybody can get some. Think of a Web hosting account in the same way. You might want to have a section of it devoted to your blog. You might want another section of it to be devoted to your favorite links. With or without subdomains this can be done. However, with subdomains the process is so much easier to navigate.