repeater控件获取标头的控件并用字符串替换掉

标头是这么写的
<asp:Repeater ID="RpProduct" runat="server" onitemdatabound="RpProduct_ItemDataBound" 
                onitemcommand="RpProduct_ItemCommand" >
        <HeaderTemplate>
            <table  width="100%" border="0" cellpadding="0" cellspacing="1" align="center" class="Admin_Table">
                <thead>
                    <tr class="Admin_Table_Title">
                        <th>
                            <asp:LinkButton ID="id" runat="server" CommandName="id">编号</asp:LinkButton></th>
                        <th>
                            <asp:LinkButton ID="board" runat="server" CommandName="board">审核版块</asp:LinkButton></th>
                        <th>
                            <asp:LinkButton ID="childBoard" runat="server" CommandName="childBoard">审核子版块</asp:LinkButton></th>
                        <th >
                            <asp:LinkButton ID="title" runat="server" CommandName="title">标　　题</asp:LinkButton></th>
                        <th>
                            <asp:LinkButton ID="witer" runat="server" CommandName="witer">发 布 人</asp:LinkButton></th>
                        <th>
                            <asp:LinkButton ID="applyTime" runat="server" CommandName="applyTime">申请时间</asp:LinkButton></th>
                        <th>
                            <asp:LinkButton ID="paperStatus" runat="server" CommandName="paperStatus">审核状态</asp:LinkButton></th>
                        <th>
                            <asp:LinkButton ID="verifyType" runat="server" CommandName="verifyType">审核类型</asp:LinkButton></th>
                        <th>
                            <asp:LinkButton ID="CreateTime" runat="server" CommandName="CreateTime">审核时间</asp:LinkButton></th>
                        <th>
                            基本操作</th>
                        
                    </tr>
                </thead>
        </HeaderTemplate>
我想在Button的click方法中提取出这些LinkButton 并用字符串替换掉  ，应该怎么做啊！！！！