The Twilio REST API Helper Library for .NET developers provides a simplified way to interact with the Twilio REST API. The library wraps the entire REST API in a set of managed APIs, allowing developers to access its capabilities via a familiar .NET API. To get started, install the Twilio helper library using NuGet and create an instance of the `TwilioRestClient` class by providing your Account SID and Auth Token. The library provides methods such as `SendSmsMessage`, which sends an SMS message, and `InitiateOutboundCall`, which makes outbound calls from Twilio. The methods can be called with optional parameters to customize the behavior. The library also returns objects that contain status information about the call, allowing developers to check for errors or exceptions. Additionally, some methods allow developers to specify a large number of options as part of the REST request using objects that can be set and provided to the method.