how to send free sms from windows form application in c#

Hello Durga..can you try this links:

1) http://www.c-sharpcorner.com/uploadfile/3bff37/sending-sms-via-windows-form-application/

2) https://social.msdn.microsoft.com/Forums/en-US/908b1e42-9f53-4915-8e72-0c358b328177/how-to-send-free-sms-in-windows-application-using-c?forum=ncl

3) http://surajpassion.in/send-sms-using-c-application/

4) http://www.dotnetspark.com/Forum/1328-how-to-send-free-sms-from-windows-application.aspx

5) https://www.codeproject.com/Articles/1089358/Send-SMS-Using-ViaNett-in-Csharp-Application

6) https://www.codeproject.com/Questions/840577/How-to-send-SMS-from-windows-application-using-csh