C# SDK - Get X-Rate-Limit headers from response

Using the RingCentral .Net SDK, you can check API limit header as shown below:

static RestClient rcsdk;

static void Main(string[] args)
{
  rcsdk = new RestClient(RINGCENTRAL_CLIENTID, RINGCENTRAL_CLIENTSECRET, RINGCENTRAL_PRODUCTION);
  rcsdk.Authorize(RINGCENTRAL_USERNAME, RINGCENTRAL_EXTENSION, RINGCENTRAL_PASSWORD).Wait();
  rcsdk.AfterHttpCall += EventHandler;
}
static void EventHandler(object sender, HttpCallEventArgs eventArgs)
{
  var rateLimitRemaining = eventArgs.httpResponseMessage.Headers.First(i => i.Key == "X-Rate-Limit-Remaining").Value.First();
  Console.WriteLine("Remaining: " + rateLimitRemaining);
}

What version of the RingCentral .NET SDK do you use?

RingCentral .NET SDK 5.x has major changes and there are many source breaks. It supports SDK extensions mechanism. And to catch the events, create and install the EventsExtension as shown below:

RestClient rcsdk = new RestClient(RC_CLIENTID, RC_CLIENTSECRET, RC_PRODUCTION);
rcsdk.Authorize(RC_USERNAME, RC_EXTENSION, RC_PASSWORD).Wait();
var eventsExtension = new EventsExtension();
rcsdk.InstallExtension(eventsExtension).Wait();
eventsExtension.RequestSuccess += EventHandler;
...
static void EventHandler(object sender, HttpMessages httpMessages)
{
    var rateLimitRemaining = httpMessages.httpResponseMessage.Headers.First(i => i.Key == "X-Rate-Limit-Remaining").Value.First();
    Console.WriteLine("Remaining: " + rateLimitRemaining);
}

1. var eventsExtension = new EventsExtension();

What do I have to do to make it work for EventsExtension as I am getting an error to create a namespace for it. Do I have to install some package from Nuget?

What do you mean by "create and install the EventsExtension as shown below: ". Can you clarify this?

I will try this and report back. Thank you for quick reply.