The Record Source is the Table or Query (or SQL Statement) that contains the Records of a Bound Form.
The Control Source is what a given Control displays. If it is a Bound Control, it displays a Field from the underlying Record Source. If is is Unbound, it can display the results of an Expression, Calculation or Function.
Simply put, a Record Source relates to a Form, a Control Source to a Control. Form.
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Beat out by the Man of the Mountain!
The problem with making anything foolproof...is that fools are so darn ingenious!
All posts/responses based on Access 2003/2007