winform程序访问一个web方法，传递参数，返回数据

/// <summary>        /// 获取web中接口，返回一个xml，把xml转化为Dataset        /// </summary>        /// <returns></returns>        public DataSet GetHttpWebRequest()        {            string time = this.datetime.Value.ToString();//获取时间            string account = this.txtAccount.Text.ToString().Trim();//获取帐号            string pwd = this.txtpwd.Text.ToString().Trim();//获取密码            pwd = Encrypt3DES("25585455", "v6es3d81");//对密码进行3des加密            //拼接URL            string formUrl = "http://www.8000yi.com/Interface/GetWaitticketOrder.aspx";            //把参数编码一下            string formData = "WaitTicket=" + HttpUtility.UrlEncode("<WaitTicket><Account>szx168b</Account><Password>" + pwd + "</Password><Gettime>2012-03-08 19:18:00</Gettime></WaitTicket>");            string formData1 = "WaitTicketDetails=" + HttpUtility.UrlEncode("<WaitTicketDetails><Account>szx168b</Account><Password>" + pwd + "</Password><OrderID>I634790038020066065</OrderID></WaitTicketDetails>");            CookieContainer cookieContainer = new CookieContainer();            formUrl = formUrl + "?" + formData;            // 设置提交的相关参数             HttpWebRequest request = WebRequest.Create(formUrl) as HttpWebRequest;            request.Method = "GET";            request.KeepAlive = false;            request.AllowAutoRedirect = true;            request.ContentType = "application/x-www-form-urlencoded";            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)";            request.CookieContainer = cookieContainer;            HttpWebResponse SendSMSResponse = (HttpWebResponse)request.GetResponse();            StreamReader SendSMSResponseStream = new StreamReader(SendSMSResponse.GetResponseStream());            string strRespone = SendSMSResponseStream.ReadToEnd();            DataSet ds = XmlToDataSet(strRespone);            if (ds == null || ds.Tables == null || ds.Tables.Count < 0)            {                MessageBox.Show("暂时没有需要出票的订单！");            }            else            {                this.dataGridView.DataSource = ds.Tables[0];            }            SendSMSResponse.Close();            SendSMSResponseStream.Close();            return ds;        }

web请问一个页面，发参数过去

                            WebRequest request = WebRequest.Create(url);                        WebResponse response = request.GetResponse();                        Stream resStream = response.GetResponseStream();