میتونی از این ایده بگیری :



<%@ Page Language="C#‎" AutoEventWireup="true" Inherits="IncrementalDownloadGrid"

    CodeBehind="IncrementalDownloadGrid.aspx.cs" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title>Untitled Page</title>



    <script type="text/javascript">

        function GetBookImage(img, url)

        {

            // Detach the event handler (we'll make just one attempt).

            img.onload = null;

            // Try to get the picture.

            img.src = 'GetBookImage.aspx?isbn='+url;

        }

    </script>



</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:GridView ID="DataGrid1" runat="server" AutoGenerateColumns="False" BorderColor="#CC9966"

            BorderStyle="None" BorderWidth="1px" BackColor="White" CellPadding="4" Font-Names="Verdana"

            Width="100%" Font-Size="X-Small">

            <SelectedRowStyle Font-Bold="True" ForeColor="#663399" BackColor="#FFCC66"></SelectedRowStyle>

            <RowStyle ForeColor="#330099" BackColor="White"></RowStyle>

            <HeaderStyle Font-Bold="True" ForeColor="#FFFFCC" BackColor="#990000"></HeaderStyle>

            <FooterStyle ForeColor="#330099" BackColor="#FFFFCC"></FooterStyle>

            <Columns>

                <asp:BoundField DataField="Title" HeaderText="Title"></asp:BoundField>

                <asp:BoundField DataField="isbn" HeaderText="ISBN"></asp:BoundField>

                <asp:BoundField DataField="Publisher" HeaderText="Publisher"></asp:BoundField>

                <asp:TemplateField>

                    <HeaderTemplate>

                        Book Cover

                    </HeaderTemplate>

                    <ItemTemplate>

                        <img src="UnknownBook.gif" alt="Book" onerror="this.src='Unknownbook.gif';" onload="GetBookImage(this, '<%# Eval("isbn") %>');">

                    </ItemTemplate>

                </asp:TemplateField>

            </Columns>

            <PagerStyle HorizontalAlign="Center" ForeColor="#330099" BackColor="#FFFFCC"></PagerStyle>

        </asp:GridView>

    </div>

    </form>

</body>

</html>