---
title: CSharp-SDK - 3.1.0
slug: feature-experimentation/release-notes/csharp-sdk-3-1-0
docTags: 
createdAt: 2026-07-20T15:45:30.265Z
---

May 9th, 2019

\### New Features:
\* Introduced Decision notification listener to be able to record:
\* Variation assignments for users activated in an experiment.
\* Feature access for users.
\* Feature variable value for users.

\### Bug Fixes:
\* Feature variable APIs return default variable value when featureEnabled property is false. (\[#151]\([https://github.com/optimizely/csharp-sdk/pull/151](https://github.com/optimizely/csharp-sdk/pull/151)))

\### Deprecated:
\* Activate notification listener is deprecated as of this release. Recommendation is to use the new Decision notification listener. Activate notification listener will be removed in the next major release.

[https://github.com/optimizely/csharp-sdk/releases/tag/v3.1.0](https://github.com/optimizely/csharp-sdk/releases/tag/v3.1.0)