private void update_Click(object sender, EventArgs e)
         {
             WebClient client = new WebClient();
             Stream stream = client.OpenRead("Ссылка на файл");
             StreamReader sr = new StreamReader(stream);

             String content = sr.ReadToEnd();
             if (content == "1")
             {
                 DialogResult one = MessageBox.Show("Хотите обновить клиент?", "Update Found", MessageBoxButtons.YesNo);
                 if (one == DialogResult.Yes)
                 {
                     Process.Start();
                 }
             }