Моя ошибка, я нашел метод с именем Batch
внутри ContactsRequest
class
newContact.Title = name;
newContact.Name.FullName = name;
EMail primaryEmail = new EMail(email);
primaryEmail.Primary = true;
primaryEmail.Rel = ContactsRelationships.IsWork;
newContact.Emails.Add(primaryEmail);
newContact.BatchData = new GDataBatchEntryData();
newContact.BatchData.Id = i.ToString();
newContact.BatchData.Type = GDataBatchOperationType.insert;
i ++;
list.Add(newContact);
А потом
cr.Batch(list, new Uri(f.AtomFeed.Batch), GDataBatchOperationType.insert);