MongoDB.Collection.Save C# (CSharp) Method

        public object Save(IDictionary<string, object> obj, bool safe = false)
        {
            if (!obj.ContainsKey("_id"))
              {
            return Insert(obj, safe);
              }
              Update(new Doc { { "_id", obj["_id"] } }, obj, true, false, safe);
              return obj["_id"];
        }