嵌套在Repeater1 中的CheckBox2 不管是否选中都执行？

代码:
  <asp:Repeater ID="Repeater1" runat="server">
        <ItemTemplate>
        <tr>
        <td><asp:CheckBox ID="CheckBox2" runat="server" /></td>
        <td><%#Eval("nid")%></td>
        <td><%#Eval("ItemId")%></td>
        <td><asp:Label ID="lbltm" runat="server" Text='<%#Eval("CommodityCode") %>'></asp:Label></td>
        <td><asp:Label ID="lblhm" runat="server" Text='<%#Eval("ItmeName")%>'></asp:Label></td>
        <td><%#Eval("CanOrder") %></td>
        <td><asp:Label ID="lbldw" runat="server" Text='<%#Eval("Unit")%>'></asp:Label></td>
        <td><asp:Label ID="Label1" runat="server" Text='<%#Eval("Retail")%>'></asp:Label></td>
        <td><asp:Label ID="Label2" runat="server" Text='<%#Eval("zkl")%>'></asp:Label></td>
        <td><asp:TextBox ID="TextBox1" runat="server" onmouseover="this.focus();this.select();"  onclick="if(value==defaultValue){value='';this.style.color='#999'}" onBlur="if(!value){value=defaultValue;this.style.color='#999'}" AutoPostBack="True" Text="0" ontextchanged="TextBox1_TextChanged"></asp:TextBox></td>
        <td><asp:Label ID="lblzj" runat="server" ></asp:Label></td>
      </tr>
        </ItemTemplate>
        </asp:Repeater>//后台   foreach (RepeaterItem Item1 in Repeater1.Items)
        {
            int i = 1;
            CheckBox chk = (CheckBox)Item1.FindControl("CheckBox2");
            if (chk.Checked)
            {
                foreach (RepeaterItem Item in Repeater1.Items)
                {
                    Label lbltm = (Label)Item.FindControl("lbltm");//商品条码
                    Label lblhm = (Label)Item.FindControl("lblhm");//货名
                    Label lbldw = (Label)Item.FindControl("lbldw");//单位
                    Label lb = (Label)Item.FindControl("Label1");//零售价
                    Label lb2 = (Label)Item.FindControl("Label2");//折扣率
                    TextBox tb = (TextBox)Item.FindControl("TextBox1");//订购数量
                    Label lblzj = (Label)Item.FindControl("lblzj");//总金额                    DataRow row = dtTable.NewRow();
                    row["nid"] = i;//序号
                    row["CommodityCode"] = lbltm.Text;
                    row["ItmeName"] = lblhm.Text;
                    row["Unit"] = lbldw.Text;
                    row["Retail"] = lb.Text;
                    row["zkl"] = lb2.Text;
                    row["zcoutn"] = tb.Text;
                    row["moneys"] = lblzj.Text;
                    i++;
                    dtTable.Rows.Add(row);
                }
                
            }
        }嵌套在Repeater1 中的CheckBox2 不管是否选中都执行？
我没选中的也执行，调试的时候  if (chk.Checked) 这里老是为 true
为什么呢？
我要的结果是 ，选中了，就执行，不选中的就跳出! 拜托了