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

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上图是我用DataGrid控件做的显示数据界面截图,当点击“同意”或者“不同意”时,就是显示“网页有错误:'Page_Validators' 未定义,请问是什么问题?

ASP.NET代码如下

<%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>


后台CS代码如下:

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();
}
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补充:.NET技术 ,  ASP.NET
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