protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            labUser.Text = Session["userID"].ToString();
            imgBtnSubmit.Attributes.Add("OnClick", "javascript:return confirm('确实要交卷吗？')");
            lblPaperName.Text = Session["PaperName"].ToString();
            InitData();

            
        }
        
    }
    protected void Timer1_Tick(object sender, EventArgs e)
    {
        this.Label45.Text= "1";
    }

<td align=center><a name="top"></a>
                        <asp:ScriptManager ID="ScriptManager1" runat="server">
                        </asp:ScriptManager>
                            
                                        
                        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                        <ContentTemplate>
                        <table>
                        <tr>
                        <td>
                        <font color=#4D2600 size="5"><asp:Label ID="Label7" runat="server" Text="考试试题："/><asp:Label ID="Label30" runat="server" Text="<<"/><asp:Label ID="lblPaperName" runat="server"></asp:Label><asp:Label ID="Label3" runat="server" Text=">>"/></font> 
                        
                            <asp:Timer ID="Timer1" runat="server" Interval="1000" ontick="Timer1_Tick">
                            </asp:Timer>
                            <asp:Label ID="Label45" runat="server" Text="Label"></asp:Label>
                        
                        </td>
                        </tr>
                        </table>
                        
                        </ContentTemplate>
                        </asp:UpdatePanel>                        
                                        
                        
                    </td>