图片只显示了一半？为什么？

using  System;
using  System.Data;
using  System.Configuration;
using  System.Collections;
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;
using  System.Net;
using  System.IO;

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

        
        

        WebRequest request = WebRequest.Create("http://bbs.rulaionline.com/RLVerifyCode.aspx");
        // If required by the server, set the credentials.
        request.Credentials = CredentialCache.DefaultCredentials;
        // Get the response.
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        //int Length = int.Parse(response.ContentLength.ToString());


        // Display the status.
        Console.WriteLine(response.StatusDescription);
        // Get the stream containing content returned by the server.
        Stream dataStream = response.GetResponseStream();
        //int Length = 10000000;
        // Open the stream using a StreamReader for easy access.
        //===========================

        int read=0;
        byte[] Content = new byte[8080];
        BinaryReader reader = new BinaryReader(dataStream);


        reader.Read(Content, 0, Content.Length);
            

        Response.BinaryWrite(Content);

            
        
       




        //===========================
        //byte[] Content = new byte[Length];
        //dataStream.Read(Content, 0, Length);

        //输出到页面

        //Response.BinaryWrite(Content);//图片数据





        //StreamReader reader = new StreamReader(dataStream);
        // Read the content.
        //string responseFromServer = reader.ReadToEnd();
        // Display the content.
        //Response.Write(responseFromServer);
        //Response.Write(dataStream);
        // Cleanup the streams and the response.
        reader.Close();
        dataStream.Close();
        response.Close();

    }
}