How to WhatsApp Send message in C#

What's App Number Send Message For C# code  

Dim3 Technology and solutions

 Visual studio solution Right click-->manage nuget packages for solution -->search whatsapp api install

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

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

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

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

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

            waobj.Login();        };

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

        waobj.Connect();