Классы (переменую res записать в richTextBox1)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Security.Cryptography;
using System.Text.RegularExpressions;
 
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        
        private void button1_Click(object sender, System.EventArgs e)
        {
            sender mC = new sender();
            
            mC.send("http://188.93.22.242/socialcity/action.ashx?act=19&nocache=1314451696%2E906&ver=12&uid=******&t=***********", "1,2,3,4,5,6,7");
            mC.parse("id=\"", "\" lv");
            
            mC.displayResult();
        }
        
       
 
    }
}
public class sender
{
    extern string GlobVar;
    public static string res;
    private int result;
    
    private string Response;
    string StrNewValue;
    //constructor without a parameter defaults to 0
    public sender()
    {
        result = 0;
    }
   
   
   
    public void displayResult()
    {
        MessageBox.Show(res);
    }
    public void parse(string l,string r)
    {
        Regex g5 = new Regex(l+"(.*?)"+r);
        
       
        if (g5.IsMatch(Response))
        {
            MatchCollection matches = g5.Matches(Response);
 
            foreach (Match y in matches) { res += y.Groups[1].ToString() + ",";  }
        }
        GlobVar = res;
    }
    public void send(string url,string post)
    {
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Proxy = new WebProxy("127.0.0.1", 8888); 
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        StrNewValue = post;
 
        req.ContentLength = StrNewValue.Length;
        StreamWriter Soup = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
        Soup.Write(StrNewValue);
        Soup.Close();
        StreamReader stin3 = new StreamReader(req.GetResponse().GetResponseStream());
        Response = stin3.ReadToEnd();
    }
}

richTextBox1.Text = sender.res;

private void button1_Click(object sender, System.EventArgs e)

private void button1_Click(object s, System.EventArgs e)