//Send ( button_click )
        string from = "9199********";
        string to = txtTo.Text;//Sender Mobile
        string msg = txtMessage.Text;

        WhatsApp wa = new WhatsApp(from, "BnXk*******B0=", "NickName", true, true);

        wa.OnConnectSuccess += () =>
        {
            MessageBox.Show("Connected to whatsapp...");

            wa.OnLoginSuccess += (phoneNumber, data) =>
            {
                wa.SendMessage(to, msg);
                MessageBox.Show("Message Sent...");
            };

            wa.OnLoginFailed += (data) =>
            {
                MessageBox.Show("Login Failed : {0}", data);
            };

            wa.Login();
        };

        wa.OnConnectFailed += (ex) =>
        {
            MessageBox.Show("Connection Failed...");
        };

        wa.Connect();