public bool DeleteCategory(int mainCategoryId)
        {
            CategoryEntity mainCategory = new CategoryEntity(mainCategoryId);

            foreach (CategoryEntity item in mainCategory.Categories)
            {
                item.Delete();
            }
            return(mainCategory.Delete());
        }
        public bool DeleteSubCategory(int subCategoryId)
        {
            CategoryEntity subCategory = new CategoryEntity(subCategoryId);

            return(subCategory.Delete());
        }