smarty 怎么实现i++

smarty 如何实现i++
在html页面    smarty如何实现i++
如何把下面这段C#代码翻译成smarty下的代码？

<br />
<%<br />
                   int i_count = 0; <br />
                   foreach (GridViewRow row in this.GridView1.Rows)<br />
                   {<br />
                          if (i_count%4 == 0)<br />
                          {<br />
%><br />
                                 <div>.1..<div><br />
<%<br />
                          }<br />
                          else<br />
                           {<br />
%><br />
                                 <div>.2..<div><br />
<%<br />
                            }<br />
                           i_count ++ ;<br />
                    }<br />
%><br />

我写的是这样，但是ERROR

<br>
<br>
                   {assign var="i_count"}<br>
                   {foreach from=$row item=item}<br>
                   <br>
                          {if $i_count mod 4}<br>
                          <br>
                                 <div>.2..<div>
<br>
                        <br>
                          {else}<br>
                           <br>
                                 <div>.1..<div> <div class="clear">
                 
              
              
        
            </div>
</div>
</div>
</div>
</div>