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Use the BaseValidator.Text property to specify the text to display in a validation control when validation fails. You can also display a summary of all controls that fail validation in the page by using a System.Web.UI.WebControls.ValidationSummary control. To specify the text to display in a System.Web.UI.WebControls.ValidationSummary control, use the BaseValidator.ErrorMessage property.
If you set the BaseValidator.ErrorMessage property without setting the BaseValidator.Text property, the value of the BaseValidator.ErrorMessage property is also displayed in the validation control.