如何在后台定义<td>里面的字段
代码:
<td   style= "height:   286px;   width:   394px; ">  
<table   width= "500 "   border= "0 "   cellspacing= "0 "   cellpadding= "0 ">
<tr   align= "center ">  
<td   class= "p3 "   > <br/>   <%=dr[ "Title "]%> </td>
</tr>  
<tr   align= "center ">  
<td   style= "height:   49px ">   <div>   <hr   size= "1 "   style= "height:   28px;   width:   190px; "   id= "HR1 "   onclick= "return   HR1_onclick() "   />  
<font   color= "#999999 " "> [ <%=dr[ "Time "]%> ] </font>   <br/>  
</div>  
</td>  
</tr>  
<tr>  
<td   style= "height:   33px ">  
  <%  
if(dr[ "Image "]   !=   " ")   {  
Response.Write( " <Image   src=‘ "   +   dr[ "Image "]   +   "‘   border=0   align=‘left‘   width=‘20‘   height=‘200‘> ");  
}  
%> <br/>   <%=dr[ "Content "]%>
</td>  
</tr>  
<tr>  
<td>   <br   />  
<br/>   摘自：   <%=dr[ "ComeTo "]%>  
<br/>  
</td>  
</tr>  
<tr>  
<td   style= "height:   18px ">  
<div   align= "right "> </div>  
</td>  
</tr>  
</table>  
</td>  
</tr>  
<tr>  
<td   height= "17 "   style= "width:   394px ">  
<table   width= "498 "   border= "0 "   cellspacing= "0 "   cellpadding= "0 "   "mmto.gif "   style= "height:   27px ">  
<tr>  
<td   width= "172 "   style= "background:mmto.gif;   height:   18px; "> 本条消息被浏览了  
<font   color= "#FF3333 "> [ <%=dr[ "Counter "]%> ] </font> 回  
</td>  
报错:
未将对象引用设置到对象的实例。  
说明:   执行当前   Web   请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。  

异常详细信息:   System.NullReferenceException:   未将对象引用设置到对象的实例。

源错误:  


行   68:   <table   width= "500 "   border= "0 "   cellspacing= "0 "   cellpadding= "0 ">
行   69:   <tr   align= "center ">  
行   70:   <td   class= "p3 "   > <br/>   <%=dr[ "Title "]%> </td>
行   71:   </tr>  
行   72:   <tr   align= "center ">  
 
那么怎么定义呢?
谢谢!


------解决方案--------------------
楼主 要先确定d