Convert Udi to URL?

Questions
1

Hi

I select a node in Umbraco. This saves it as

umb://document/123456

I would like to convert this to the equivalent URL. How could i do that?

I tried

var url = Udi.Parse("umb://document/123456");

as per the many threads on similair questions to this but this doesnt display the corresponding URL that im after to the page, media etc etc

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/111311-convert-udi-to-url