I need to get the user's full name using his/her login id.

For example, if "John Smith" has a login ID of ABCDE, I want to create a subroutine to pass "ABCDE" and get "John Smith" returned.

I have seen examples of how to do this in workflow and in vb script. But I need to do it in VB (VB .NET to be more specific). I've spent several hours to no avail. This should be EASY!!

Can someone please give me complete sample code on how to get user's full name using their QC login id?