Use the CommandField.CausesValidation property to specify whether validation is performed when a button in a System.Web.UI.WebControls.CommandField field is clicked. When this property is set to true, by default all validation controls on the page are validated. To limit validation to only a certain group of validation controls, create a validation group and then set the ButtonFieldBase.ValidationGroup property to the validation group's name. For more information on validation groups, see BaseValidator.ValidationGroup.