if (CausesValidation && Page != null && Page.AreValidatorsUplevel (ValidationGroup)) {
ClientScriptManager csm = Page.ClientScript;
Attributes ["onclick"] += csm.GetClientValidationEvent (ValidationGroup);
if (CausesValidation && Page != null && Page.AreValidatorsUplevel (ValidationGroup)) {
ClientScriptManager csm = Page.ClientScript;
Attributes ["onclick"] += csm.GetClientValidationEvent (ValidationGroup);