1.You can use the ValidationSummary Control to summarize the messages set in theErrorMessage property of the Validation controls. The messages set in the Text property of the Validation controls can be displayed besides each element.
2.The error messages set in the SummaryText property of each Validation control havingisSummary=true will be automatically grouped at the top of the page and the messages set in the Text property can be
3. The error messages in the Validation control can only be displayed in a popup
4.The Validation controls cannot be used in the given scenario