public IEnumerable <Category> getProductByCategory(int parentId)
{
List <Category> result = new List <Category>();
result.Add(_businessCategory.GetById(parentId));
var children = _businessCategory.GetAll().Where(i => i.ParentId == parentId).ToList();
foreach (var item in children)
{
result.AddRange(getProductByCategory(item.Id));
}
return(result);
}
public Category GetById(int id)
{
return(business.GetById(id));
}