我的DataList分页有什么问题？
我把部分代码贴出来：
页面代码：
<asp:datalist   id=DataList1   runat= "server "   DataMember= "Message "   DataSource= " <%#   dataSet21   %> "   ShowFooter= "False "   DataKeyField= "M_ID "   RepeatDirection= "Horizontal "   RepeatColumns= "1 "   Width= "800px "   Height= "96px "   CellPadding= "0 ">
<HeaderTemplate>
<FONT   face= "宋体 "> 留言列表 </FONT>
</HeaderTemplate>
<EditItemStyle   Font-Size= "9pt "> </EditItemStyle>
<ItemStyle   Font-Size= "9px "> </ItemStyle>
<ItemTemplate>
<TABLE   cellSpacing= "1 "   cellPadding= "0 "   bgcolor= "#00ccff "   width= "800 "   align= "center "   border= "0 ">
<TR>
      <td   width= "100px "   bgcolor= "#FFFFFF "> <%#   DataBinder.Eval(Container,   "DataItem.M_GuestName ")   %> 的留言 </td>
<TD   bgcolor= "#FFFFFF "> <%#   DataBinder.Eval(Container,   "DataItem.M_Title ")   %> </TD>
<TD   bgcolor= "#FFFFFF "   align= "right ">
<asp:ImageButton   id=ibtnDelete   runat= "server "   Visible= ' <%#   bool.Parse(Session[ "flag "].ToString())%> '   ImageUrl= "img/delete.gif "   AlternateText= "删除 "   CommandName= "delete ">
</asp:ImageButton>
<asp:ImageButton   id=ibtnReply   runat= "server "   Visible= ' <%#   bool.Parse(Session[ "flag "].ToString())%> '   ImageUrl= "img/reply.gif "   AlternateText= "回复 "   CommandName= "edit ">
</asp:ImageButton> <%#   DataBinder.Eval(Container,   "DataItem.M_CreateTime ", "{0:d} ")   %> </TD>
</TR>
<TR>
<td   bgcolor= "#FFFFFF "> </td>
<TD   bgcolor= "#FFFFFF "   colSpan= "2 "> <%#   DataBinder.Eval(Container,   "DataItem.M_Content ")   %> <FONT   face= "宋体 "> </FONT> <BR>
</TD>
</TR>
<TR>
<td   width= "100px "   bgcolor= "#FFFFFF "> 站长回复： </td>
<TD   bgcolor= "#FFFFFF "   colSpan= "2 ">
<%#   DataBinder.Eval(Container,   "DataItem.M_AdminReply ")   %>
<FONT   face= "宋体 "> </FONT>
</TD>
</TR>
<TR>
<TD   bgcolor= "#FFFFFF "   colSpan= "3 ">
</TD>
</TR>
</TABLE>
</ItemTemplate>
<EditItemTemplate>
<FONT   face= "宋体 ">
<%#   DataBinder.Eval(Container,   "DataItem.M_Content ")   %>
<BR>
<BR>
<asp:TextBox   id= "txtReply "   runat= "server "   TextMode= "MultiLine "   Columns= "20 "   Rows= "2 "> </asp:TextBox> <BR>
<asp:Button   id= "btnReply