Problem With Bound PictureBox Using Linq

[Nima Nima]

Hi
I want to bind a picturebox Dynamically to an image field in database.
I use this code (I'm Using Northwind Database):

            using (DataClasses1DataContext dc=new DataClasses1DataContext())
            {
                var a = from p in dc.Products
                        join c in dc.Categories
                         on p.CategoryID equals c.CategoryID
                        select new
                        {
                            ProductName=p.ProductName,
                            UnitPrice=p.UnitPrice,
                            UnitInStock=p.UnitsInStock,
                            CatName=c.CategoryName,
                            CatPic=c.Picture
                        };
                this.DataSource = a.ToList();
            }

And when I set Value of picturebox to "=Fields.CatPic" Nothing display.
How I can do that
Thanx