/* 필수 클래스 */
using System.Net;
using System.IO;
WebRequest request = WebRequest.Create("url");
request.Credentials = CredentialCache.DefaultCredentials;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
// 결과물
string responseFromServer = reader.ReadToEnd();
Response.Write(responseFromServer);
// 종료
reader.Close();
dataStream.Close();
response.Close();