ASP.NET 2.0 - .NET¼¼Êõ / ASP.NET

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
  protected void Page_Load(object sender, EventArgs e)
  {

  }
  protected void Button1_Click(object sender, EventArgs e)
  {
  try
  {
  if (FileUpload1.PostedFile.FileName == "")
  {
  this.Label1.Text = "aa";
  }
  else
  {
  string filepath = FileUpload1.PostedFile.FileName;//»ñµÃ¡°ÕÕƬÎļþ·¾¶¡±ÐÅÏ¢
  string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);//»ñµÃ¡°ÕÕƬÎļþÃû³Æ¡±ÐÅÏ¢
  string serverpath = Server.MapPath("Photos/") + filename;
  FileUpload1.PostedFile.SaveAs(serverpath);
  this.Label1.Text = "ÉÏ´«³É¹¦£¡";
  Image1.ImageUrl = serverpath.ToString();
  }
  }
  catch (Exception show)
  {