Hi Jassim,
Since this forum is intended for Microsoft's products. You may ask your question somewhere on the project site or ask the owners directly if you have a question or issue regarding this API:
https://www.nuget.org/packages/WhatsAppAPI/
Please check the following thread if helps
http://www.codeproject.com/Questions/837318/send-message-by-to-whatsapp-programmatically-using
Best regards,
Kristin
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