A control’s Control Source property determines what is displayed in a control. A bound control’s
Control Source property contains the name of the underlying database field to which it is bound.
An unbound control’s Control Source property does not contain the name of an underlying
database field.
A calculated control’s Control Source property contains an expression that calculates the values
displayed in the control.
You can use the Control Source property option under the Data tab in the Properties dialog box if
you want to change the Control Source property of a control
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