C#调用HTTP接口

            string url = "http://jiekou.56dxw.com/sms/HttpInterface.aspx?comid=123&username=test&userpwd=*****";
            WebRequest wRequest = WebRequest.Create(url);
            wRequest.Method = "GET";
            wRequest.ContentType = "text/html;charset=UTF-8";
            WebResponse wResponse = wRequest.GetResponse();
            Stream stream = wResponse.GetResponseStream();
            StreamReader reader = new StreamReader(stream, System.Text.Encoding.Default);
            string str = reader.ReadToEnd();   //url返回的值
            reader.Close();
            wResponse.Close();