在Repeater添加了个LinkButton，代码如下：

<asp:Repeater ID="rpt_storeinfo" runat="server" OnItemCommand="Repeater1_ItemCommand">

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<td width="6%" align="center">
 <asp:LinkButton runat="server" ID="lbtDelete" CommandName="Delete" Text="删除"/>
</td>

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protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        //Tool.Alert("运行到这里了",this);
        string Sbianhao = ((TextBox)this.rpt_storeinfo.Items[e.Item.ItemIndex].FindControl("bianhao")).Text.Trim();
        string Sxitong = ((TextBox)this.rpt_storeinfo.Items[e.Item.ItemIndex].FindControl("xitong")).Text.Trim();

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出现问题：string Sbianhao = ((TextBox)rpt_storeinfo.Items[e.Item.ItemIndex].FindControl("bianhao")).Text.Trim();未将对象引用设置到对象的实例。