asp.net提交和接受数据流

提交页面：

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    public string  Webrequest(string url, byte[] byt)
    {
        HttpWebRequest web = (HttpWebRequest)WebRequest.Create(url);
        web.Method = "POST";
        web.ContentLength = byt.Length;
        Stream str = web.GetRequestStream();
        str.Write(byt, 0, byt.Length);
        str.Close();

        //接受返回
        HttpWebResponse webresp = (HttpWebResponse)web.GetResponse();
        Stream strm = webresp.GetResponseStream();
        StreamReader sr = new StreamReader(strm,Encoding.Default);
        string msg = sr.ReadToEnd();
        sr.Close();
        webresp.Close();
        
        return msg;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string url = string.Format("http://localhost:52435/WebSite1/Default3.aspx?id={0}", 10);
        //读取文件
        string filepath = Server.MapPath(@"201005121757351752.xls");
        FileStream filestream = new FileStream(filepath,FileMode.Open ,FileAccess.Read);
        byte[] byt = new byte[filestream.Length];
        filestream.Read(byt, 0, byt.Length);
        filestream.Close();
        filestream.Dispose();
        //输出返回值
        string back = Webrequest(url, byt);
        Response.Write(back);
    }
}

接受页面：

public partial class Default3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //接受参数
        string id =Convert.ToString(Request["id"]);
        if (id == null)
            Response.Write("object is null");
        else
        {
            //接受数据流创建文件
            Stream stream = Request.InputStream;
            byte[] byt = new byte[stream.Length];
            stream.Read(byt, 0, byt.Length);
            string createnewfile = Server.MapPath(@"aa.xls");
            File.WriteAllBytes(createnewfile, byt);
            Response.Write("create successful！");
        }
    }
}