crm2011 C# 1 to n or n to 1

Question

 I have a N to 1 or 1 to N application.
But the value has been not written into the physical field .

         
                Entity location1 = new Entity("new_testuser");
                location1["new_name"] = "loueas-" + DateTime.Now.ToString("yyyyMMddhhmm");
                                              
                ConditionExpression condition1 = new ConditionExpression();
                condition1.AttributeName = "fullname";
                condition1.Operator = ConditionOperator.Like;
                condition1.Values.AddRange(new object[] { "ru%" });

                //過濾不是在條件內的項目
                FilterExpression filter1 = FilterExpression();
                filter1.Conditions.Add(condition1);

                //查詢出資料表達
                QueryExpression qeLocations = new QueryExpression("systemuser");
                qeLocations.ColumnSet = new ColumnSet(true);
                qeLocations.AddOrder("systemuserid", OrderType.Descending);
                qeLocations.Criteria.AddFilter(filter1);
                var queryAns = tempOrganization.RetrieveMultiple(qeLocations);
               
                //textBox1.Text += queryAns.Entities.Count + Environment.NewLine;
                Entity room1 = new Entity("systemuser"); //位址名稱

                foreach (var i in queryAns.Entities)
                {
                    room1["fullname"] = i;
                    EntityCollection roomCollection = new EntityCollection();
                    roomCollection.EntityName = "systemuser"; //
                    roomCollection.Entities.Add(room1);
                    Relationship roomRelationship1 = new Relationship("new_systemuser_new_testuser_sales");
                    location1.RelatedEntities[roomRelationship1] = roomCollection;
                }

Error message:An unexpected error occurred.

Where can I find to be modified or new program?