C#中如何下载大文件、隐藏文件真实地址

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string filepath = "c:\\Fetion2010_3.6.1900.exe";
System.IO.Stream iStream = null;
byte[] buffer = new Byte[10000];
int length;
long dataToRead;
string filename = System.IO.Path.GetFileName(filepath);
try
{
    iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
         System.IO.FileAccess.Read, System.IO.FileShare.Read);
    dataToRead = iStream.Length;

    Response.Clear();
    Response.ClearContent();
    Response.ClearHeaders();

    Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
    Response.AddHeader("Content-Transfer-Encoding", "binary");
    Response.Charset = "gb2312";
    Response.ContentType = "text/xml";

    while (dataToRead > 0)
    {
        if (Response.IsClientConnected)
        {
            length = iStream.Read(buffer, 0, 10000);
            Response.OutputStream.Write(buffer, 0, length);
            Response.Flush();

            buffer = new Byte[10000];
            dataToRead = dataToRead - length;
        }
        else
        {
            dataToRead = -1;
        }
    }

    Response.Close();
}
catch (Exception ex)
{
    Response.Write("Error : " + ex.Message);
}
finally
{
    if (iStream != null)
    {
        iStream.Close();
    }
}