in AdventureWorksMVC/Business/ProductManager.cs [134:142]
public static List<string> GetProductSize(int categoryId)
{
List<string> sizeList = null;
sizeList = (from p in Common.DataEntities.Product
where p.Size != null && p.ProductSubcategory.ProductSubcategoryID == categoryId
orderby p.Size
select p.Size).Distinct().ToList();
return sizeList;
}