protected void Page_Load(object sender, EventArgs e) { string str = ImageCreator.RndCode(4); Session["CheckCode"] = str; Bitmap image = ImageCreator.CreateAddCodeImage(str, true, 70, 22, 30); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, ImageFormat.Gif); image.Dispose(); this.Context.Response.ClearContent(); this.Context.Response.ContentType = "image/gif"; this.Context.Response.BinaryWrite(ms.ToArray()); }