Standard URL encode function?

Question

Is there a Delphi equivalent of this .net's method:

Url.UrlEncode()

Note
I haven't worked with Delphi for several years now. As I read through the answers I notice that there are several remarks and alternatives to the currently marked answer. I haven't had the opportunity to test them so I'm basing my answer on the most upvoted.
For your own sake, do check later answers and after deciding upvote the best answer so everybody can benefit from your experience.

Answer 1

Look at indy IdURI unit, it has two static methods in the TIdURI class for Encode/Decode the URL.

uses   IdURI;  .. begin   S := TIdURI.URLEncode(str); //   S := TIdURI.URLDecode(str); end;