how to show image in image control from database in asp.net

con.Open();
cmd = new OleDbCommand("select product_img from purchase where Model_no='" + comboBox2.Text + "'", con);
da = new OleDbDataAdapter(cmd);
ds = new DataSet();
da.Fill(ds);
byte[] MyData = new byte[0];
DataRow myRow;
myRow = ds.Tables[0].Rows[0];
MyData = (byte[])myRow[0];
MemoryStream stream = new MemoryStream(MyData);
pictureBox1.Image = Image.FromStream(stream);
pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;

con.Close();