Close queueitem

Use the code template from here

If you need to close the queueitem after creating a case from an email, here you go with the code

target is of type entity "email"

Code:

        if (target.Contains("regardingobjectid"))
        {
            EntityReference _object = (EntityReference)target["regardingobjectid"];

            if (_object.LogicalName == "incident")
            {
                CloseQueueItem(_object.Id, service);
            }
        }

Code:

public static bool CloseQueueItem(Guid _sourceId, IOrganizationService service)
    {

        Guid _queueItemId = Guid.Empty;
        bool _queueItemClosed = false;

        ConditionExpression ent_ce1 = new ConditionExpression("objectid", ConditionOperator.Equal, _sourceId);
        ConditionExpression ent_ce2 = new ConditionExpression("statecode", ConditionOperator.Equal, 0);
        FilterExpression ent_fe = new FilterExpression(LogicalOperator.And);
        ent_fe.AddCondition(ent_ce1);
        ent_fe.AddCondition(ent_ce2);

        QueryExpression ent_qe = new QueryExpression();
        ent_qe.EntityName = "queueitem";
        ent_qe.Criteria = ent_fe;
        ent_qe.ColumnSet = new ColumnSet("queueitemid", "queueid", "objectid");
        ent_qe.PageInfo.ReturnTotalRecordCount = true;
        EntityCollection ent_coll = service.RetrieveMultiple(ent_qe);

        if (ent_coll.Entities.Count > 0)
        {
            foreach (Entity _queueItem in ent_coll.Entities)
            {
                EntityReference enRef = (EntityReference)_queueItem["objectid"];
                PluginHelper.SetState(_queueItem.LogicalName, _queueItem.Id, 1, 2, service);
            }
            _queueItemClosed = true;
        }

        return _queueItemClosed;
    }