public async Task <bool> DeleteItemAsync(int index) { using (var doc = _db.GetDocument(CoreApp.DocId)) using (var mdoc = doc.ToMutable()) using (MutableArrayObject listItems = mdoc.GetArray(CoreApp.ArrKey)) { listItems.RemoveAt(index); _db.Save(mdoc); } _items.Remove(index); return(await Task.FromResult(true)); }