这代码哪里出错，麻烦帮忙看看

<% @Page Language="C#" %>
<% @Import Namespace="System.IO" %>
<%
string strDir2List = Request.QueryString.Get("dir");
Directory thisOne = null;
try
{
thisOne = new Directory(strDir2List);
Response.Write("<p>Creation:"+
thisOne.CreationTime.ToString()+"</p>");
Directory[] subDirectories = thisOne.GetDirectories();
Response.Write("<ul>");
for (int i=0;i<subDirectories.Length;i++)
{
Response.Write("<li><a href=\"listdir.aspx?dir=");
Response.Write(Server.UrlEncode(subDirectories[i].FullName));
Response.Write("\">"+subDirectories[i].Name);
Response.Write("</a><br>");
}
Response.Write("</ul>");
File[] theFiles = thisOne.GetFiles();
Response.Write("<ul>");
for (int i=0;i<theFiles.Length;i++)
{
Response.Write("<li><a href=\"showfile.aspx?file=");
Response.Write(Server.UrlEncode(theFile[i].FullName));
Response.Write("\">" + theFiles[i].Name);
Response.Write("</a><br>");
}
Response.Write("</ul>");
}
catch(Exception e)
{
Response.Write("Access not possible, error:<i>");
Response.Write(e.ToString() + "</i>");
Response.End();
}
%>