repeater取值问题
前台代码：
<ItemTemplate>
  <tr>
  <td align="left">
  <asp:CheckBox ID="cb_id" CssClass="checkall" runat="server" />
  </td>
  <td align="left">
  <asp:ImageButton ID="ibtnLock" CommandName="ibtnLock" runat="server" ImageUrl='<%# Convert.ToInt32(Eval("NIsLock")) == 1 ? "Images/correct.gif" : "Images/disable.gif"%>'
  ToolTip='<%# Convert.ToInt32(Eval("NIsLock")) == 1 ? "取消锁定" : "设置锁定"%>' />
  <asp:ImageButton ID="ibtnTop" CommandName="ibtnTop" runat="server" ImageUrl='<%# Convert.ToInt32(Eval("NIsTop")) == 1 ? "Images/ico-1.png" : "Images/ico-1_.png"%>'
  ToolTip='<%# Convert.ToInt32(Eval("NIsTop")) == 1 ? "取消置顶" : "设置置顶"%>' />
  </td>
  </tr>
</ItemTemplate>
后台代码：
 protected void rptList_ItemCommand(object source, RepeaterCommandEventArgs e)
  {
  int id = Convert.ToInt32(((Label)e.Item.FindControl("lb_id")).Text);
  string str;
  str = "select * from T_News where Nid=" + id;
  DataTable dt = DbHelper.GetDataTable(str);
  switch (e.CommandName.ToLower())
  {
  case "ibtnlock":
  if (dt.Rows[0]["NIsLock"].ToString() == "1")
  {
  str = "update T_News set NIsLock=0 where Nid= " + id;
  try
  {
  DbHelper.NoResultCommand(str);
  }
  catch (Exception)
  {

  throw;
  }
  }
  else
  {
  str = "update T_News set NIsLock=1 where Nid= " + id;
  try
  {
  DbHelper.NoResultCommand(str);
  }
  catch (Exception)
  {

  throw;
  }
  }
  break;
  case "ibtntop":
  if (dt.Rows[0]["NIsTop"].ToString() == "1")
  {
  str = "update T_News set NIsTop=0 where Nid= " + id;
  try
  {
  DbHelper.NoResultCommand(str);
  }
  catch (Exception)
  {

  throw;
  }
  }
  else
  {
  str = "update T_News set NIsTop=1 where Nid= " + id;
  try
  {
  DbHelper.NoResultCommand(str);
  }
  catch (Exception)
  {