OpenURL ( webpost , get)

using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Net;

using System.IO;

using System.Text;

public class Module1
{

    private static CookieContainer cookie = new CookieContainer();
    public  string OpenURL(string URL, string Method = "GET", string PostData = null)
    {
        string functionReturnValue = null;

        HttpWebRequest request = null;

        request = (HttpWebRequest)WebRequest.Create(URL);

 

        var _with1 = request;

        _with1.UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)";

        _with1.ContentType = "application/x-www-form-urlencoded";

        _with1.Accept = "*/*";

        _with1.KeepAlive = true;

        _with1.ReadWriteTimeout = -1;

        _with1.Timeout = -1;

        _with1.Method = Method;
        // get,post등을 설정

        _with1.CookieContainer = cookie;

        if (Method == "POST")
        {
            TextWriter w = new StreamWriter(_with1.GetRequestStream());

            w.Write(PostData);

            w.Close();

            w = null;

        }

        HttpWebResponse Response = (HttpWebResponse)request.GetResponse();

        var _with2 = Response;

        if (_with2.StatusCode == HttpStatusCode.OK)
        {
            Stream receivestream = _with2.GetResponseStream();

            StreamReader readstream = null;

            readstream = new StreamReader(receivestream, System.Text.Encoding.UTF8);

            functionReturnValue = readstream.ReadToEnd();

            readstream.Close();

            _with2.Close();

        }
        return functionReturnValue;

    }

}