public List <string> LoadShoeSizeByShoe(string customerCode, string shoe) { var list = ShoeDataProvider.LoadShoeSizeByShoe(shoe, customerCode); int count = 0; if (list == null) { count = 20; } else { count = 20 - list.Count; } for (int i = 0; i < count; i++) { list.Add(string.Empty); } return(list); }