– What’s the best method in ASP.NET to obtain the current domain

I am wondering what the best way to obtain the current domain is in ASP.NET?

For instance: should yield should yield

As a guide, I should be able to add a url like "/Folder/Content/filename.html" (say as generated by Url.RouteUrl() in ASP.NET MVC) straight onto the URL and it should work.

Best Solution

Same answer as MattMitchell's but with some modification. This checks for the default port instead.

Edit: Updated syntax and using Request.Url.Authority as suggested