validation on date field present on main form on click of usercontrol button

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C#3.0

C#

Windows

I have a windows form on which
I have a few controls like textboxes, checkboxes, and Date field
and a user control with verify button.


My requirement is on click of the verify button (user control), a validation should happen on the date field present on the main form

if the date field value is null a popup should come saying that date field is null else should execute the logic on button click.