asp.net讀取二進位圖片

//    將位元據轉為物理檔案
//    byte[] data =(byte[])dt.Rows[0]["Head"];  //擷取資料庫中的圖片流(image類型)
    public void bytes2picFile(byte[] data)
    {
      string url = "images/" + DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".jpg";      
      FileStream fs =new FileStream(Server.MapPath(url),System.IO.FileMode.Create);
      fs.Write(data, 0, data.Length);
      fs.Close();
      this.Image1.ImageUrl = url;
    }

  //將檔案轉為位元據
    public byte[] picFile2bytes(string picFilePath)
    {
      FileStream fs = new FileStream(picFilePath, FileMode.Open, FileAccess.Read);
      byte[] bytePhoto = new byte[fs.Length];
      fs.Read(bytePhoto, 0, (int)fs.Length);
      fs.Close();
      return bytePhoto;      
    }