.net中怎么调用外部的接口

url：http://interFace1.test.com/apis/interFaceTest.aspx?id=123&pwd=123 HttpWebRequest myReq = (HttpWebRequest)HttpWebRequest.Create("接口地址-URL");
myReq.Timeout = 12000;
HttpWebResponse HttpWResp = (HttpWebResponse)myReq.GetResponse();
Stream myStream =HttpWResp.GetResponseStream();
StreamReader sr = new StreamReader(myStream, Encoding.Default);
string  tempString = sr.ReadToEnd();