asp.net2.0使用ajax的timer去定时刷新一个updatapanle的问题

Question

我在asp.net2.0中使用ajax的timer去定时刷新一个updatapanle，只用一个用户的时候没有问题，可是多个用户同时访问就弹出the status code returned from the server was 500，我把updatapanle去掉又没有错误了，怎么解决啊?
原来我以为是代码有问题，可是把updatapanel去掉运行了一个小时也没有报错误，page上设置了ValidateRequest="false"也没有用，这个到底是什么原因，怎么解决啊，各位帮帮忙

Answer 1

我建议这类实时轮循的东西不要用UpdatePanel，而是用‘轻量级’的javascript + Web Service， client-callback也行。

Answer 2

//前臺代碼
                            <asp:ScriptManager ID="ScriptManager1" runat="server">
                            </asp:ScriptManager>
                            <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                                <ContentTemplate>
                                    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4"
                                ForeColor="#333333" GridLines="None" meta:resourcekey="GridView1Resource1">
                                <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                                <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
                                <EditRowStyle BackColor="#999999" />
                                <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
                                <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
                                <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                                <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
                                <Columns>
                                   <asp:BoundField DataField="username" HeaderText="用戶名" meta:resourcekey="BoundFieldResource1" >
                                      
                                       <ItemStyle Width="60px" />
                                   </asp:BoundField>
                                    <asp:BoundField DataField="message" HeaderText="留言" meta:resourcekey="BoundFieldResource2"  >
                                        <ItemStyle Width="380px" />
                                    </asp:BoundField>
                                    <asp:BoundField DataField="createtime" HeaderText="時間" meta:resourcekey="BoundFieldResource3"  >
                                        <ItemStyle Width="150px" />
                                    </asp:BoundField>
                                    
                                </Columns>
                            </asp:GridView>
                                    <asp:Timer ID="Timer1" runat="server" Interval="5000" OnTick="Timer1_Tick1">
                                    </asp:Timer>
                                </ContentTemplate>
                            </asp:UpdatePanel>//後臺代碼
    protected void Timer1_Tick1(object sender, EventArgs e)
    {
        BindGridView();  
    }