ExactTarget/FuelSDK-CSharp — pull request #5 by psapir (2014-01-30 17:48:02+00:00)
Title: Contemplating FUEL API Sandbox URL when SOAP endpoint points to Sandbox

For sandbox accounts, the SDK will return a 401 status when trying to retrieve a token since it's pointing to the production fuel API URL. I've made a small update to allow sandbox accounts to connect to the api.