How to send whatsapp message from c#

Question

Dear Team,

 

would you help me out regarding WhatsAppApi, i was unable to generate password.

 

here is my sample code

 

string password;

string repsonse;

WhatsAppApi.Register.WhatsRegisterV2.RequestCode("971XXXXX", out password, out repsonse, "sms", null);

MessageBox.Show(password); // im getting here null

MessageBox.Show(repsonse); // im getting here "status" : fail, "old_version"