private void button1_Click(object sender, EventArgs e) { try { TrimClient trimClient = new TrimClient("http://[IPaddress]/HPECMServiceAPI"); // Change [IPaddress] to match your ServiceAPI machine trimClient.Credentials = System.Net.CredentialCache.DefaultCredentials; long PersonUri = 0; long GroupUri = 0; Location myloc = new Location() { Uri = PersonUri }; // Change [PersonUri] to the person location you want to the member of a group location myloc.AddAction( new AddRelationship() { RelatedLocation = new LocationRef() { Uri = GroupUri }, // Change [GroupUri] to the group location you want to add the membership to RelationshipType = LocRelationshipType.MemberOf, MakeThisTheDefaultRelationship = false } ); LocationsResponse locresp1 = trimClient.Post <LocationsResponse>(myloc); if (locresp1.ResponseStatus.Message != null) { MessageBox.Show(locresp1.ResponseStatus.Message); } else { MessageBox.Show("Association Updated"); } } catch (Exception ex) { MessageBox.Show(ex.Message); } }