Serialization Breaks in .Net 4.5

How do I check for a URL's top-level domain in ASP.NET/C#?

 if (Request.Url.Host.ToLower().EndsWith(".fr"))
  {
    ...
  }

Get domain name of a url in C# / .NET

You can do this to get just the last two segments of the host name:

string[] hostParts = new System.Uri(sURL).Host.Split('.');
string domain = String.Join(".", hostParts.Skip(Math.Max(0, hostParts.Length - 2)).Take(2));

Or this:

var host = new System.Uri(sURL).Host;
var domain = host.Substring(host.LastIndexOf('.', host.LastIndexOf('.') - 1) + 1);

This method will find include at least two domain name parts, but will also include intermediate parts of two characters or less:

var host = new System.Uri(sURL).Host;
int index = host.LastIndexOf('.'), last = 3;
while (index > 0 && index >= last - 3)
{
    last = index;
    index = host.LastIndexOf('.', last - 1);
}
var domain = host.Substring(index + 1);

This will handle domains such as localhost, example.com, and example.co.uk. It's not the best method, but at least it saves you from constructing a giant list of top-level domains.

easy way to get the top level domain?

It's called a toplevel domain (tld) but for the BBC that's just "uk", not "co.uk".

What you want does not follow a standard so you'll need a table to check 'potential' pseudo-tld's

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