Sample code to update Access Mode of System User in C# (CRM 2016 or earlier)

Recently had a requirement to set Access Mode of around 500 users to Administrative from Read – Write. We wrote an on demand workflow for that. However, running that workflow on those 500 records in a batch of 100 records was causing them to stuck in waiting stage and we had to then manually resume those workflow instance. So we ended up writing a Console Application for that.


   QueryExpression queryExpression = new QueryExpression();
            queryExpression.EntityName = "systemuser";
            queryExpression.ColumnSet = new ColumnSet();
            queryExpression.ColumnSet.AddColumn("fullname");

            ConditionExpression conditionExpression1 = new ConditionExpression();
            conditionExpression1.AttributeName = "tk_businessarea";
            conditionExpression1.Values.Add("EE286698-AF08-E311-B55E-1CC1DE6DAA0B");
            conditionExpression1.Operator = ConditionOperator.Equal;

            ConditionExpression conditionExpression2 = new ConditionExpression();
            conditionExpression2.AttributeName = "isdisabled";
            conditionExpression2.Values.Add(false);
            conditionExpression2.Operator = ConditionOperator.Equal;

            // access mode ==> 0 --> Read Write and 1 --> Adminstrative
            ConditionExpression conditionExpression3 = new ConditionExpression();
            conditionExpression3.AttributeName = "accessmode";
            conditionExpression3.Values.Add(1);
            conditionExpression3.Operator = ConditionOperator.Equal;
            
            queryExpression.Criteria.AddCondition(conditionExpression1);
            queryExpression.Criteria.AddCondition(conditionExpression2);
            queryExpression.Criteria.AddCondition(conditionExpression3);

            queryExpression.Criteria.FilterOperator = LogicalOperator.And;

            EntityCollection entityColl = organizationProxy.RetrieveMultiple(queryExpression);
            foreach(var entity in entityColl.Entities)
            {
                Entity userEntity = new Entity("systemuser");
                userEntity.Id = entity.Id;
                userEntity.Attributes["accessmode"] = new OptionSetValue(0);
                organizationProxy.Update(userEntity);
            }

Hope it helps !!