The installation manual suggests testing for a valid file upload by checking
if (IsPostBack && inputFieldId.TmpFile != null)
but TmpFile is obsolete. So I am assuming it is valid just to check to see if
inputFieldId != null
or is there a better way?
Yes, you beat me to it. I realized I was looking at the old doc that I downloaded from one of your links that (if I recall) was downloaded from a Novell site.(?)
I will always refer to the latest documentation, as this is a good habit especially with quickly evolving software!