Associate and Disassociate Many to Many relationship records using C# in Microsoft Dynamics CRM 2011

Below code used to associate and disassociate records for Many to Many relationship through C#.

For ex: If there we have created Many to Many relationship between Contact and Account. The association of records will be like below.

                   

                    AssociateRequest request = new AssociateRequest();
                    EntityReference moniker1 = new EntityReference("contact", new Guid(contactGuid));
                    EntityReference moniker2 = new EntityReference("account", new Guid(businessGuid));
                    EntityReferenceCollection relatedEntities = new EntityReferenceCollection();
                    relatedEntities.Add(moniker1);
                    request.Target = moniker2;
                    request.RelatedEntities = new EntityReferenceCollection { moniker1 };
                    request.Relationship = new Relationship("crisp_account_contact");
                    service.Associate(moniker2.LogicalName, moniker2.Id, request.Relationship, relatedEntities);

To Disassociate the record:

            AssociateRequest request = new AssociateRequest();
            EntityReference moniker1 = new EntityReference("contact", new Guid(contactGuid));
            EntityReference moniker2 = new EntityReference("account", new Guid(businessGuid));

            EntityReferenceCollection relatedEntities = new EntityReferenceCollection();
            relatedEntities.Add(moniker1);
            request.Target = moniker2;
            request.RelatedEntities = new EntityReferenceCollection { moniker1 };
            request.Relationship = new Relationship("crisp_account_contact");
            service.Disassociate(moniker2.LogicalName, moniker2.Id, request.Relationship, relatedEntities);

To retrieve the records associated between Account and Contact use fetchXml as below.

string fetchXml = @"<fetch version='1.0' " +
                           "output-format='xml-platform' " +
                           "mapping='logical'>" +
                           "<entity name='contact'>" +
                           "<filter type='and'>" +
                               "<condition attribute='statecode' operator='eq' value='0'/>" +
                           "</filter>" +
                           "<link-entity name='crisp_account_contact' from='contactid' to='contactid' visible='false' intersect='true'>" +
                             "<filter type='or'>" +
                               "<condition attribute='accountid' operator='eq' value='" + businessId + "'/>" +
                             "</filter>" +
                          "</link-entity>" +
                          "</entity>" +
                           "</fetch>";

           EntityCollection  entityCollection = service.RetrieveMultiple(new FetchExpression(fetchXml));

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