datalist多项删除
前台文件是:

<asp:datalist   id= "Datalist1 "   runat= "server ">
<HeaderTemplate>
<TABLE   width= "100% "   border= "0 "   cellPadding= "1 "   cellSpacing= "0 "   bgcolor= "#6699FF ">
<TR>
<TD   align= "center "> <strong> 标   题 </strong> </TD>
<TD   width= "80 "   align= "center "> <strong> 编辑 </strong> <input   onclick= "checkalldelid(this.form) "   type= "checkbox "   value= "ON "   name= "checkalldel ">
<script   language= "javascript ">
<!--
    function   checkalldelid(form)
    {
          for   (var   i=0;i <form.delid.length;i++)
          {
              var   e   =   form.delid[i];
              if   (e.name   !=   'chkall ')
                  e.checked   =   form.checkalldel.checked;
          }
    }
   

-->
</script>
</TD>
</TR>
</TABLE>
</HeaderTemplate>
<AlternatingItemStyle   BackColor= "#E2E9FF "> </AlternatingItemStyle>
<ItemTemplate>
<TABLE   style= "TABLE-LAYOUT:   fixed;   WORD-BREAK:   break-all "   height= "22 "   cellSpacing= "0 "   cellPadding= "0 "
width= "100% ">
<TR   onmouseout= "this.style.backgroundColor=&quot;&quot; "   onmouseover= "this.style.backgroundColor=&quot;#dddddd&quot; ">
<TD>
<asp:HyperLink   id= "HyperLink1 "   runat= "server "   Target= "_blank "   Text= ' <%#   DataBinder.Eval(Container.DataItem,   "RsjTitle ")   %> '   NavigateUrl= ' '   ToolTip= ' <%#   DataBinder.Eval(Container.DataItem,   "RsjTitle ")   %> '>
</asp:HyperLink>
</TD>
<TD   width= "80 "   align= "center ">
<asp:HyperLink   id= "Hyperlink2 "   runat= "server "   Text= '修改 '   NavigateUrl= ' <%#   DataBinder.Eval(Container.DataItem,   "id ", "Admin_News_Edit.aspx?ID={0} ")%> '   ToolTip= '修改 '>
</asp:HyperLink>
<asp:CheckBox   id= "CheckBox1 "   runat= "server "   value= ' <%#   DataBinder.Eval(Container.DataItem,   "ID ")   %> '> </asp:CheckBox>
<asp:Label   id= "Label1 "   runat= "server "> <%#   DataBinder.Eval(Container.DataItem,   "id ")   %> </asp:Label>
</TD>
</TR>
</TABLE>
</ItemTemplate>
</asp:da