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请告诉我什么是中庸"checkAll(本)","Check_Click(本)",在给定的上下文?试图从一个GridView选中复选框转让行。得到错误N给定的条件。

<asp:GridView ID="gvAll" runat="server"

AutoGenerateColumns = "false" Font-Names = "Arial"

Font-Size = "11pt" AlternatingRowStyle-BackColor = "#C2D69B" 

HeaderStyle-BackColor = "green" AllowPaging ="true"  

OnPageIndexChanging = "OnPaging" PageSize = "10" >

<Columns>

<asp:TemplateField>

    <HeaderTemplate>

      <asp:CheckBox ID="chkAll" runat="server" onclick = "checkAll(this);"

        AutoPostBack = "true"  OnCheckedChanged = "CheckBox_CheckChanged"/>

    </HeaderTemplate>

    <ItemTemplate>

      <asp:CheckBox ID="chk" runat="server" onclick = "Check_Click(this)"

       AutoPostBack = "true"  OnCheckedChanged = "CheckBox_CheckChanged" />

    </ItemTemplate>

</asp:TemplateField>

<asp:BoundField DataField = "CustomerID" HeaderText = "Customer ID"

 HtmlEncode = "false" />

<asp:BoundField DataField = "ContactName" HeaderText = "Contact Name"

HtmlEncode = "false" />

<asp:BoundField DataField = "City" HeaderText = "City"

HtmlEncode = "false" />

</Columns>

<AlternatingRowStyle BackColor="#C2D69B"  />

</asp:GridView>

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