I'm trying to get the UserInfo by UserID (not necessarily the current user).

I try this basic code, but I get an Exception: "Object reference is not set to an instance of the object"

//  0 is the correct portalID and 5 is a valid userID; I just used these values to test

UserInfo siteUser = new siteUser();
UserController uc = new UserController();
siteUser = uc.GetUser(0, 5);

Any ideas on what I am doing wrong?

it wont work -either your external webservice does not have a httpcontext or else (more likely) it's web.config does not have the entries that dotnetnuke reads to set up it's context - instead most people would use something such as iweb (http://iweb.codeplex.com/) to allow external callers (note: a future version of dotnetnuke will have a services framework to help with this)

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