public string GetDepartmentDepartmentPath(string ancestorDepartmentID, string offspringDepartmentID)
    {
        if (!header.VerifyCredentials(header.UserName, header.Password, header.Type))
        {
            return(string.Empty);
        }

        Guid gAncestorDepartmentID = (Guid)XmlSerializer.Deserialize(ancestorDepartmentID);

        Guid gOffspringDepartmentID = (Guid)XmlSerializer.Deserialize(offspringDepartmentID);

        return(XmlSerializer.Serialize(OrganizationPublicHelper.GetDepartmentDepartmentPath(gAncestorDepartmentID, gOffspringDepartmentID)));
    }