SurveyMonkey have announced they'll kill the v2 api on December 1st 2016. A new project to support the v3 api is at https://github.com/bcemmett/SurveyMonkeyApi-v3
.NET library for querying the Survey Monkey API. Install it with NuGet: PM> Install-Package SurveyMonkeyApi
Usage notes are at https://www.simple-talk.com/blogs/2014/08/10/new-net-library-for-accessing-the-survey-monkey-api/