--image_data is an IMAGE field
SqlCommand cmd = new SqlCommand("SELECT image_data FROM GRAPHIC WHERE ID = 5", cn);
--Load into Byte Array
byte[] b = (byte[])cmd.ExecuteScalar();
MemoryStream ms = new MemoryStream(b);
--Load stream into an image object
Image img = Image.FromStream(ms);
pictureBox1.Image = img;