REST Client in C# from Swagger

Are other C# users building their REST client manually or were you able to use Visual Studio or Autorest to build it out from the swagger files?

Using the Party swagger definition, I get "Exception: Object reference not set to an instance of an object.".

I was able to get a Membership client but all of the methods end up being set to return void instead of the using the models included in the definition.

Just looking to see if there is a quick/automated way or if we should just built it out old school?