private void ExecutePreUpdate(LocalPluginContext obj)
    {
            Logger.WriteMessage("Enter ExecutePreUpdate", CrmLogService.MessageLevel.Info, "");
        if ((obj.PluginExecutionContext.InputParameters.Contains("Target")) && (obj.PluginExecutionContext.InputParameters["Target"] is Entity))
        {
            Entity serviceAppontment = (Entity)obj.PluginExecutionContext.InputParameters["Target"];


            if (serviceAppontment.LogicalName != "serviceappointment")
                return;
            Logger.WriteMessage("", CrmLogService.MessageLevel.Info, "");

            DateTime DateTimeNow = DateTime.Now;
            DateTime myDt;


            if ((serviceAppontment.Attributes.Contains("scheduledstart")) && (serviceAppontment.Attributes.))
            {
                try
                {
                    //what to do after if goes in
                }
                catch (Exception ex)
                {
                    Logger.WriteException(ex);
                }

            }