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();