c#隐藏图片真实名称及路径

图片显示页:

<img src='myphoto.aspx?do=" + Convert.ToBase64String(System.Text.Encoding.Default.GetBytes(ds.Tables[0].Rows[low_j]["sp_pic"].ToString()))

CS:

protected void Page_Load(object sender, EventArgs e)
{
    if(!this.IsPostBack)
    {
BindData("/sch_shop/spin_img/",Encoding.Default.GetString(Convert.FromBase64String(Request.QueryString["do"])));
    }
}

private void BindData(string photo_dir,string photo_name)
{
   //FileStream fs = new FileStream(@"D:\22-11-46-3-524454584.jpg",FileMode.Open,FileAccess.Read);
   FileStream fs = new FileStream(Server.MapPath(photo_dir + photo_name), FileMode.Open, FileAccess.Read);
   byte[] mydata = new byte[fs.Length];
   int Length = Convert.ToInt32(fs.Length);
   fs.Read(mydata,0,Length);
   fs.Close();
   this.Response.OutputStream.Write(mydata,0,Length);
   this.Response.End();
}