C# question - how do I convert a PageURI & Href to an absolute URL/URI?

How do I convert a PageU开发者_JS百科RI & Href to an absolute URL/URI in C#?

i.e. I am scanning a web page at a given PageURI and in the HTML have link/node with a HREF, and want to translate this HREF into a valid absolute URI.

Background - note the trouble I was having here

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new URI(uri, string) does it