I'm using .Net C# and I'm trying to send  binary Turkish message via API.

<?xml version="1.0" encoding="UTF-8"?>
<sms version="1">
<orig ton="Alphanumeric">XTelekom</orig>

the message text is corrupted. I think I'm making a mistake in base64 conversion of message text.
I guess it's not enough to converte the message text directly into base64 format.
How should I use a method?

can someone help?

thanks in advance