Confusion with UserManagement SearchUsers

I have Imported SAP.Portal.Services.UserManagement and am looking to search user Display Names based on a users LogonID. Here is my code so far:

....

Dim uInfo As UserInfo = um.SearchUsers(strLogonID)

If someone can explain how to get this to return the Display Name after using an Input for the LogonID, that would be great.

Regards,

Peter