ListBox 上移下移

前台HTML ：

  <div style="width: 600px; margin: 0px auto;">
     <div style="float: left">
    　　  <asp:ListBox ID="lsBoxHotWord" runat="server" Height="300px"></asp:ListBox>
     </div>
     <div style="float: left; margin-top: 40px;">
          <asp:Button ID="btnTop" runat="server" Text="上移" Width="150px" Height="50px" OnClick="btnTop_Click" />
          <br />
          <asp:Button ID="btnBottom" runat="server" Text="下移" Width="150px" Height="50px" OnClick="btnBottom_Click" />
          <br />
          <span style="font-size: 12px; color: Red">排序规则：
          <br />
          &nbsp&nbsp&nbsp&nbsp -按排序序号和添加时间排序
          <br />
          &nbsp&nbsp&nbsp&nbsp -序号越小越靠前，最新添加的最前显示 </span>
      </div>
</div>

 

后台代码：

    protected void btnTop_Click(object sender, EventArgs e)
    {
        if (lsBoxHotWord.SelectedIndex > 0)
        {
            string name = lsBoxHotWord.SelectedItem.Text;
            string ID = lsBoxHotWord.SelectedItem.Value;
            int index = lsBoxHotWord.SelectedIndex;
            lsBoxHotWord.SelectedItem.Text = lsBoxHotWord.Items[index - 1].Text;
            lsBoxHotWord.SelectedItem.Value = lsBoxHotWord.Items[index - 1].Value;
            lsBoxHotWord.Items[index - 1].Text = name;
            lsBoxHotWord.Items[index - 1].Value = ID;
            lsBoxHotWord.SelectedIndex--;
        }

        int t = lsBoxHotWord.Items.Count;
        for (int i = 0; i < t; i++)
        {
            bool isSuess = HotWordMgr.UpdateWordSort(i.ToString(), lsBoxHotWord.Items[i].Value);
        }
        DataBingLv();
    }
    protected void btnBottom_Click(object sender, EventArgs e)
    {
        if (lsBoxHotWord.SelectedIndex >= 0 && lsBoxHotWord.SelectedIndex < lsBoxHotWord.Items.Count - 1)
        {
            string name = lsBoxHotWord.SelectedItem.Text;
            string ID = lsBoxHotWord.SelectedItem.Value;
            int index = lsBoxHotWord.SelectedIndex;
            lsBoxHotWord.SelectedItem.Text = lsBoxHotWord.Items[index + 1].Text;
            lsBoxHotWord.SelectedItem.Value = lsBoxHotWord.Items[index + 1].Value;
            lsBoxHotWord.Items[index + 1].Text = name;
            lsBoxHotWord.Items[index + 1].Value = ID;
            lsBoxHotWord.SelectedIndex++;
        }
        int t = lsBoxHotWord.Items.Count;
        for (int i = 0; i < t; i++)
        {
            bool isSuess = HotWordMgr.UpdateWordSort(i.ToString(), lsBoxHotWord.Items[i].Value);
        }
        DataBingLv();//重新绑定数据方法
    }