Как сохранить html страницу в Windows-1251 кодировке?

var sait = new WebClient().DownloadString(zapros);

var sw = new StreamWriter("html.html", false, Encoding.GetEncoding(1251));
sw.Write(sait);
sw.Close();

        public static void GetStringHtml(string url,string fullnamelocation)
        {
            WebClient webClient = new WebClient();
            webClient.Encoding = Encoding.UTF8;
            StreamWriter sw = new StreamWriter(fullnamelocation, false,Encoding.UTF8);
            sw.WriteLine(webClient.DownloadString(url));
            sw.Close();
        }

GetStringHtml(@"https://www.cyberforum.ru", @"C:\1.txt");

            WebClient webClient = new WebClient();
            webClient.Encoding = Encoding.Default;
            StreamWriter sw = new StreamWriter(fullnamelocation, false,Encoding.Default);
            sw.WriteLine(webClient.DownloadString(url));
            sw.Close();

            WebClient webClient = new WebClient();
            webClient.Encoding = Encoding.Default;
            string sourceCode = webClient.DownloadString(url);
            StreamWriter sw = new StreamWriter(fullnamelocation, false,Encoding.Default);
            sw.WriteLine(sourceCode);
            sw.Close();

            string zapros = textBox1.Text;
            WebClient webClient = new WebClient();
            webClient.Encoding = Encoding.UTF8;
            string sourceCode = webClient.DownloadString(zapros);
            var kodstranici = Regex.Matches(sourceCode, @"(?<=charset=).*(?=" + kv + ")");
            foreach (Match m in kodstranici)
            kod = m.Value;
            string sait2 = Regex.Replace(sourceCode, kod, win);
            StreamWriter sw = new StreamWriter("html.html", false, Encoding.UTF8);
            sw.WriteLine(sait2);
            sw.Close();

   
         WebClient webClient = new WebClient();
            webClient.Encoding = Encoding.Default;
            string sourceCode = webClient.DownloadString(url);
            StreamWriter sw = new StreamWriter(fullnamelocation, false,Encoding.Default);
            string x = Regex.Replace(sourceCode, "(?<=charset=)(.*)(?=")", "Windows-1251");
            sw.WriteLine(x);
            sw.Close();