Well, I know more knowlegeable people than I will respond, but don't you need some kind of criterion in the last spot of that expression? I usually write these expressions like this
=DCount("[TagNo]","[Product]","[TagNo]=forms!frminputbox![TagNoinTextbox]"
where the "forms!frm...." is a reference to text box on a form where the user has entered a value that you want to count. You could put any kind of criterion there.
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