How do I send whatsapp message from C#

See more:

C#

WhatsApp

I have installed WhatsApp API from nuGet package manager and tried to implement code but could not register my mobile number through WART(WhatsApp Registration Tool).Its giving error LIKE {Status:"Failed",Reason:"Bad_Request"} all the time. I have searched a lot.But there is no any solution to this issue. There is only tool i.e. WART for registration.

Is there any new updates OR WART is still working?

What I have tried:

public JsonResult SendMessage(string sendTo,string message)
    {
        var response = false;
        string from = "91XXXXXXXXXX"; //(Enter Your Mobile Number)
        String password;
        var res = WhatsAppApi.Register.WhatsRegisterV2.RequestCode(from, out password);
        WhatsApp wa = new WhatsApp(from, password, "abc.com", false, false);
        wa.OnConnectSuccess += () =>
        {
            wa.OnLoginSuccess += (phonenumber, data) =>
            {
                wa.SendMessage(sendTo, message);
                response = true;
            };
            wa.OnLoginFailed += (data) =>
            {
                response = false;
            };

            wa.Login();
        };
        wa.OnConnectFailed += (Exception) =>
        {
            response = false;
        };
        return Json(response);
    }