asp.net 按钮有关联到事件，点击时却不执行
前台： <%@   Control   Language= "c# "   AutoEventWireup= "false "   Codebehind= "user_left.ascx.cs "   Inherits= "online_live.user.user_left "   TargetSchema= "http://schemas.microsoft.com/intellisense/ie5 "%>
<table   width= "208 "   height= "335 "   cellspacing= "0 "   bgcolor= "#efefe7 "   border= "1 ">
<TBODY>
<tr   height= "40% ">
<td   valign= "top ">
<table   width= "100% "   height= "160 "   border= "1 ">
<tr>
<td   height= "31 "   colspan= "2 "   align= "center "   background= "img/gaobei_shardh.gif "> 站内搜索 </td>
</tr>
<tr>
<td   colspan= "2 "   align= "center "> 请输入你要搜索的内容 </td>
</tr>
<tr>
<td   align= "right "   width= "83 "   valign= "top "   style= "WIDTH:   83px;   HEIGHT:   37px ">
关键字:
</td>
<td   style= "HEIGHT:   37px "> <form   name= "form6 "   method= "post "   action= " ">
&nbsp;
<asp:TextBox   id= "gjz "   runat= "server "   Width= "96px "> </asp:TextBox>
</form>
</td>
</tr>
<tr>
<td   align= "center "   colspan= "2 ">
&nbsp;
<asp:Button   id= "search "   runat= "server "   Text= "搜索 "> </asp:Button>
</td>
</tr>
</table>
<table   width= "100% "   height= "160 "   border= "1 ">
<tr>
<td   colspan= "2 "   align= "center "> 个人资料 </td>
</tr>
<tr>
<td   align= "right "> 用户名： </td>
<td>
<asp:Label   id= "yhm "   runat= "server "   Width= "59px "> </asp:Label> </td>
</tr>
<tr>
<td   align= "right "> 年龄： </td>
<td>
<asp:Label   id= "age "   runat= "server "   Width= "56px "> </asp:Label> </td>
</tr>
<tr>
<td   colspan= "2 "   align= "center "> <a   href= "user_info.aspx "> 更改我的资料 </a> </td>
</tr>
<tr>
<td   colspan= "2 "   align= "center "> 上传我的视频 </td>
</tr>
<tr>
<td   colspan= "2 "   align= "center "> 查看我的视频 </td>
</tr>
</table>
</td>
</tr>
</TBODY>
</table>
后台代码：
namespace   online_live.user
{
using   System;
using   System.Data;
using   System.Drawing;