Answer / raghumadhav tirunagari

In most cases, client-side validation is performed when the
focus leaves a user control that has a validator assigned to
it by hitting the tab key or clicking on another control.
This is not the case, however, with a required field
validator. The control isn't validated until the user clicks
a button whose CausesValidation property is set to true or
if the user erases information from a control that
previously contained data.

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