title: OnMessage event doesn't fire in Telegram.Bot package
body: <p>Hi experts :) I'm trying to show a MessageBox whenever my telegram bot receives a message . I have used Telegram.Bot package and written these codes :</p>
  
  <pre><code>       TelegramBotClient Bot = new TelegramBotClient("MyToken");
  
      public Form1()
      {
          InitializeComponent();
      }
  
      private void Form1_Load(object sender, EventArgs e)
      {
          Bot.OnMessage += Bot_OnMessage;
          Bot.OnUpdate += Bot_OnUpdate;
  
      }
  
      private void Bot_OnMessage(object sender, Telegram.Bot.Args.MessageEventArgs e)
      {
          MessageBox.Show(e.Message.Text);
      }
  
      private void Bot_OnUpdate(object sender, Telegram.Bot.Args.UpdateEventArgs e)
      {
          var botClient = (TelegramBotClient)sender;
          MessageBox.Show(e.Update.Message.Text);
      }
  </code></pre>
  
  <p>but it doesn't show messagebox when I send a message to my bot .
  What's the matter ? :S</p>