score:0

contactinvitationssent = pendingcontactlist.collectioncontent
                                    .where(x => x.contact.incoming == false)
                                    .select(x => x).tolist();

score:2

contactinvitationsent.addrange(pendingcontactlist.collectioncontent
                                                .where(i => !i.contact.incoming);

score:3

  foreach(var invitation in pendingcontactlist.collectioncontent
                     .where(item => !item.contact.incoming)) 
    contactinvitationssent.add(invitation);

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