Hi nvanalfen
Thanks for posting here.
To add the Twilio libraries to your Visual Studio project:
1. Open your solution in Visual Studio.
2. Right-click References.
3. Click Manage NuGet Packages...
4. Click Online.
5. In the search online box, type twilio.
6. Click Install on the Twilio package.
Here is a document you can refer to.
https://azure.microsoft.com/en-us/documentation/articles/twilio-dotnet-how-to-use-for-voice-sms/
Or you can go to Twilio official web page for more help.
https://www.twilio.com
Best Regards,
Sera Yu
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