.net自带上传组件的应用

private void BtnUpLoad_Click(object sender, System.EventArgs e)
{
     string path="";
     string fileName="";
     string extension="";
 try
 {
    if(this.upFile.PostedFile.FileName.Trim()!="")
    {
        //上传文件
        extension = Path.GetExtension(this.upFile.PostedFile.FileName).ToLower();
    if(extension==".xls"||extension==".mdb"||extension==".odc"||extension==".mde"||extension==".udl")
    {
        fileName = DateTime.Now.ToString("yyyyMMddhhmmss");
        path = Server.MapPath(".") + "\\upload\\" + fileName + extension;
    }
    else
    {
        Response.Write("<script>window.alert('请上传正确格式的文件！')</script>");
        return;
    }
        this.upFile.PostedFile.SaveAs(path);
        this.Url.Text="http://localhost/Agent/HCMange/upload/"+fileName+extension;
        Response.Write("<script>window.alert('上传成功！')</script>");
     }
  }
  catch
  {
     Response.Write("<script>window.alert('上传失败！')</script>");
  }