How to Send SMS via C# Code in a WinForm Application ?

It's frequent question here in CP, so browse here Send SMS - CP Search[^]

You can find many articles & past questions with multiple answers, Enjoy.

Try
Send and Read SMS through a GSM Modem using AT Commands[^]

http://codeglobe.blogspot.com/2009/02/sending-sms-in-cnet-using-gsm-modem-and.html[^]

Use AT commands[^] to send and receive SMS via GSM Modem/Cellphone.

Remember that it is using a diffent encoding (GSM default alphabet (GSM 03.38)[^]) where something like sending a "@" char is encoded as 0x00.

Use AT+CSCS to set TE character set to support the correct encoding.
AT+CSCS=? to list all supported encodings. But please note, that not all GSM units/modem support all types of encoding.

To really make it the correct way. You have to switch SMS message format to PDU encoding via AT+CMGF command.

Via PDU format, you can select the correct encoding, make long SMS ( over 160 char ), sending pictures, ring tone etc..

Send and Read SMS through a GSM Modem using AT Commands[^]

Twilio has a C# library just waiting for you to use.[^] You'll be sending SMS messages with only a few lines of code and you'll pay only $0.01 per message.

<experience>Don't message around with services/libraries that use e-mail to SMS gateways to send your messages for "free" unless do not value your own time at all.</experience>

<disclosure>I have no affiliation with Twilio.</disclosure>

here is the simple solution using way2sms / 160by2 accounts tested and working....

ClickHere for solution