public static WFBaseActivityInstance GetActivityInst(string aiID)
        {
            IWFWorkflowService     svc = Common.GetWorkFlowAPI();
            string                 activityInstanceID = aiID;// activity instance
            WFBaseActivityInstance activityInstance   = null;

            try
            {
                activityInstance = svc.GetActivityInst(activityInstanceID);
            }

            catch (Exception ex)
            {
            }
            return(activityInstance);
        }