Associate is not supported for ListMember

Hi everyone,

I am trying to create a contact-marketing list using the ListMember relationship. I am getting the error "Associate is not supported for ListMember" error despite trying couple of code variations. Could you guys please advise where I am going wrong.

Method 1:

======

AssociateRequest associateRequest =newAssociateRequest{

Target =newEntityReference(Contact.EntityLogicalName, (Guid)contactId),

RelatedEntities =newEntityReferenceCollection {  

newEntityReference(List.EntityLogicalName,

(Guid)context.CRMDataContext.ListSet.Where(l => l.ListName == option).Single().ListId) },

Relationship =newRelationship("listcontact_association") };

context.OrganizationService.Execute(associateRequest); 

Method 2

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Relationship List_Contact =newRelationship("listcontact_association");

EntityReference contact =newEntityReference(Contact.EntityLogicalName, (Guid)contactId);

EntityReference list =newEntityReference(List.EntityLogicalName,

(Guid)context.CRMDataContext.ListSet.Where(l => l.ListName == "List name").Single().ListId);

EntityReferenceCollection e =newEntityReferenceCollection();

e.Add(list);

context.OrganizationService.Associate("contact", (Guid)contactId, List_Contact, e);

Method 3

======

Relationship List_Contact =newRelationship("listcontact_association");

Entity Contact = context.CRMDataContext.ContactSet.Where(c => c.ContactId == contactId).Single();

Entity MarketingList = context.CRMDataContext.ListSet.Where(l => l.ListName == "List name").Single();

context.CRMDataContext.AddLink(MarketingList, List_Contact, Contact);

context.CRMDataContext.SaveChanges();

Any help is much appreciated.

Thanks.

Siva.