function GeneralbeforePostBack(cvMailalreadyInUseClientID, groupValidation, ePage) {
    var isEmailValid = document.getElementById(cvMailalreadyInUseClientID).isvalid;
    if (isEmailValid)
        Page_ClientValidate(groupValidation);
    if (ePage) {
        if (isEmailValid)
            return ValidateForm();
    }
    else
        return isEmailValid;
}