Нужно открыть сайт через определенный прокси - C#

 private void button2_Click(object sender, EventArgs e)
        {
            currentUri = new Uri(@"http://сайт");
            HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create("http://2ip.ru");
            WebProxy myProxy = new WebProxy("прокси");
            myRequest.Proxy = myProxy;
 
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
 
            webBrowser1.DocumentStream = myResponse.GetResponseStream();
 
            webBrowser1.Navigating += new WebBrowserNavigatingEventHandler(webBrowser1_Navigating);
 
        }
 
        void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
        {
            if (e.Url.AbsolutePath != "blank")
            {
                currentUri = new Uri(currentUri, e.Url.AbsolutePath);
                HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create(currentUri);
 
                HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
 
                webBrowser1.DocumentStream = myResponse.GetResponseStream();
                e.Cancel = true;
            }
        }