在其他aspx文件中包含aspx文件

<% if (Session["desig"].ToString() == "Developer"){%>
    <td>
        <select name='zone' id="zone" onchange="showLoc(this.value,'mlodg_loc')"> 
            <option value="Select Zone">Select Zone</option>
            <option value="East">East</option>
            <option value="West">West</option>
            <option value="North">North</option>
            <option value="South1">South1</option>
            <option value="South2">South2</option>
            <option value="South3">South3</option>
        </select>
    </td>  
<%}
  else 
  {%>
        <td>
          <select name='zone' id="Select1" onchange="showLoc(this.value,'mlodg_loc')"> 
              <option value="Select Zone">Select Zone</option>
              <option value="<%#Session["zone"]%>"><%# Session["zone"].ToString() %></option>
          </select>
        </td>
<%}%>

如果我直接编写，上面的代码可以正常工作，我试图用其他代码编写文件和主文件中，我做了 Response.WriteFile（ zone.aspx）

the code above is working fine if I am writing it directly, I tried to write this code in other file and in main file i did Response.WriteFile("zone.aspx")

我如何包含它有没有什么方法可以包含，并且还想知道一种更好的方法来编写以上语句。

How can i include it is there any way to include and also would like to know a better way to write the above statements.

谢谢