ทำไม listview ถึงออก รูปเว้นรูป ดูรูปด้านในเลยจร้า Web (ASP.NET), C#

 protected void Page_Load(object sender, EventArgs e)
        {
            strConnString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
            objConn = new SqlConnection();
            objConn.ConnectionString = strConnString;
            objConn.Open();

            //*** DataTable ***'
            SqlDataAdapter dtAdapter = default(SqlDataAdapter);
            DataTable dt = new DataTable();
            strSQL = "SELECT * FROM products WHERE ProductId = @ProductId";
            dtAdapter = new SqlDataAdapter(strSQL, objConn);
            objCmd = dtAdapter.SelectCommand;
            objCmd.Parameters.Add("@ProductId", SqlDbType.Int).Value = Request.QueryString["ProductId"].ToString();
            dtAdapter.Fill(dt);

            if (dt.Rows.Count > 0)
            {
                Response.BinaryWrite((byte[])dt.Rows[0]["ProductPic"]);
            }

            dt = null;
        }

        protected void Page_Unload(object sender, System.EventArgs e)
        {
            objConn.Close();
            objConn = null;
        }