Turning local paths from an HTML code in external accessible paths

Let's say you have a project where you coded some stuff to get all links (href) from a webpage (html) but the links are all local paths like /pages/download.php

The code provided below is an simple example on how to turn these into a full path with only needing 3 lines of code and a url.

The code below is pretty easy and short but works great.

var Url = new Uri("http://website.com/");
var newurl = new Uri(Url, "/path/download.php");
string path = newurl.ToString();

Edit
Another solution to this problem submitted by: DaveAuld
Thank you :)

String fullurl = new Uri(new Uri("http://website.com"), "/path/download.php").ToString();