HttpWebRequest提交(Post)資料

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protected void Page_Load(object sender, EventArgs e)        {            string sql = "select top 1 * from [user] order by userid asc";            DataTable dt = DBUtility.SQLHelperJJ3.Query(sql).Tables[0];            string type = "0";            string username = dt.Rows[0]["username"].ToString();            string password = dt.Rows[0]["password"].ToString();            string email = dt.Rows[0]["email"].ToString();            this.HttpPost(type, username, password, email);        }        private void HttpPost(string type, string username, string password, string email)        {            string content = "type=" + type + "&username=" + username + "&password=" + password + "&email=" + email;            string url = "http://localhost/php/index.php?Action=BatchRegist";            try            {                //擷取提交的位元組                byte[] bs = Encoding.UTF8.GetBytes(content);                //設定提交的相關參數                HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);                req.Method = "POST";                req.ContentType = "application/x-www-form-urlencoded";                 req.ContentLength = bs.Length;                //提交請求資料                Stream reqStream = req.GetRequestStream();                reqStream.Write(bs, 0, bs.Length);                reqStream.Close();                //接收返回的頁面，必須的，不能省略                WebResponse wr = req.GetResponse();                System.IO.Stream respStream = wr.GetResponseStream();                System.IO.StreamReader reader = new System.IO.StreamReader(respStream, System.Text.Encoding.GetEncoding("utf-8"));                string t = reader.ReadToEnd();                System.Web.HttpContext.Current.Response.Write(t);                wr.Close();            }            catch (Exception ex)            {                System.Web.HttpContext.Current.Response.Write("異常在getPostRespone:" + ex.Source + ":" + ex.Message);            }        }