I would like to 'police' some of the content my users enter. They're
supposed to enter names thusly: Last, First. However, some are entering
First Last.

Is there a way to have an alert pop-up if no comma is detected in the cell?
Excel's help notes on data validation are surpisingly thin.

I'm using column C starting with row 3 and continuing till 200 or son.

Thanks gang.