崩溃边缘：控件执行时出现Microsoft JScript 运行时错误: 'Page_Validators' 未定义?

<%if (flag){%>

	<tr>

		<td>

			<asp:DataGrid id="hzListDataGrid" AllowPaging="True" PageSize="10" OnPageIndexChanged="Page_Change"

				OnItemCommand="hzListDataGrid_ItemCommand" OnItemDataBound="hzListDataGrid_ItemDataBound"

				width="100%" DataKeyField="bookingID" AutoGenerateColumns="False" CellPadding="2" CellSpacing="0"

				BorderColor="#DDDDDD" BorderWidth="1" GridLines="Both" ShowHeader="true" HeaderStyle-BackColor="#F6F6F6"

				HeaderStyle-Height="20" HeaderStyle-HorizontalAlign="center" ItemStyle-Height="20" ItemStyle-HorizontalAlign="left"

				runat="server" Font-Size="9pt">

				<ItemStyle HorizontalAlign="Left" Height="30px"></ItemStyle>

				<HeaderStyle Font-Bold="True" HorizontalAlign="Center" Height="30px" BackColor="#F6F6F6"></HeaderStyle>

				<Columns>

					<asp:BoundColumn DataField="applicant" ReadOnly="True" HeaderText="申请者">

						<HeaderStyle HorizontalAlign="Center" Width="160px"></HeaderStyle>

						<ItemStyle HorizontalAlign="Center" Width="160px"></ItemStyle>

					</asp:BoundColumn>

					<asp:BoundColumn DataField="grade" ReadOnly="True" HeaderText="专业年级">

						<HeaderStyle HorizontalAlign="Center" Width="120px"></HeaderStyle>

						<ItemStyle HorizontalAlign="Center" Width="120px"></ItemStyle>

					</asp:BoundColumn>

					<asp:TemplateColumn HeaderText="实验名称">

						<HeaderStyle HorizontalAlign="Center" Width="200px"></HeaderStyle>

						<ItemStyle HorizontalAlign="Center" Width="200px"></ItemStyle>

						<ItemTemplate>

							<asp:HyperLink ID="HyperLink" runat="server" NavigateUrl='<%# "../hzInfo.aspx?id="+DataBinder.Eval(Container.DataItem, "bookingID")%>' Target="_parent" Text='<%#DataBinder.Eval(Container.DataItem,"title")%>'>

							</asp:HyperLink>

						</ItemTemplate>

					</asp:TemplateColumn>

					<asp:TemplateColumn HeaderText="使用时间">

						<HeaderStyle HorizontalAlign="Center"></HeaderStyle>

						<ItemStyle HorizontalAlign="Center"></ItemStyle>

						<ItemTemplate>

							<%# DataBinder.Eval(Container.DataItem, "time_Begin")%>

							~

							<%# DataBinder.Eval(Container.DataItem, "time_End")%>

						</ItemTemplate>

					</asp:TemplateColumn>

					<asp:BoundColumn DataField="state" ReadOnly="True" HeaderText="批复状态">

						<HeaderStyle HorizontalAlign="Center" Width="80px"></HeaderStyle>

						<ItemStyle HorizontalAlign="Center" Width="80px"></ItemStyle>

					</asp:BoundColumn>

					<asp:TemplateColumn HeaderText="批复">

						<HeaderStyle Width="100px"></HeaderStyle>

						<ItemStyle HorizontalAlign="Center" Width="100px"></ItemStyle>

						<ItemTemplate>

							<asp:LinkButton Text="同意" id="BtnApprove" CommandName="Approve" runat="server" />

							<asp:LinkButton Text="不同意" id="BtnDisApprove" CommandName="DisApprove" runat="server" />

						</ItemTemplate>

					</asp:TemplateColumn>

				</Columns>

				<PagerStyle NextPageText="上一页" Height="30px" Font-Size="10pt" Font-Names="Arial" Font-Italic="True"

					PrevPageText="下一页" HorizontalAlign="Center" Mode="NumericPages"></PagerStyle>

			</asp:DataGrid>

		</td>

	</tr>

	<%}else{%>

protected void hzListDataGrid_ItemCommand(Object sender, DataGridCommandEventArgs E)

        {

            if(E.Item.ItemType.ToString()!="Header"&&E.Item.ItemType.ToString()!="Pager")

            {

                int bookingID = Int32.Parse(hzListDataGrid.DataKeys[E.Item.ItemIndex].ToString());

                String command = ((LinkButton)E.CommandSource).CommandName;

                switch(command)

                {

                    case "Approve" :

                        ApproveBooking(bookingID);

                        break;

                    case "DisApprove":

                        DisApproveBooking(bookingID);

                        break;

                }

            }

        }

private void ApproveBooking(int bookingID)

        {

            syzxTest.db.database db=new syzxTest.db.database();

            db.ApproveBK(bookingID);

            db.Close();

            BindhzList();

        }



        private void DisApproveBooking(int bookingID)

        {

            syzxTest.db.database db=new syzxTest.db.database();

            db.DisApproveBK(bookingID);

            db.Close();

            BindhzList();

        }

补充：.NET技术 ,  组件/控件开发

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