---
title: CSharp-SDK - 4.5.0
slug: feature-experimentation/release-notes/csharp-sdk-4-5-0
docTags: 
createdAt: 2026-10-04T12:21:30.000Z
---

## 4.5.0

September 3, 2026

### New Features

**Holdout Targeted Delivery Exclusion**: Holdouts can now be configured to exclude Targeted Delivery rules, so users held out of experiments still receive their Targeted Delivery experiences. This gives you a cleaner measure of experiment impact without holding users back from ongoing rollouts.

- Add excludeTargetedDeliveries support to holdout logic ([#420](https://github.com/optimizely/csharp-sdk/pull/420))

[https://github.com/optimizely/csharp-sdk/releases/tag/v4.5.0](https://github.com/optimizely/csharp-sdk/releases/tag/v4.5.0)