---
title: CSharp-SDK - 3.3.0
slug: feature-experimentation/release-notes/csharp-sdk-3-3-0
docTags: 
createdAt: 2026-07-20T15:44:38.502Z
---

\## 3.3.0
September 26th, 2019

\### New Features:
\- Configuration manager is set to PollingProjectConfigManager and for datafile will be started by default. Requests to download and update datafile are made in a separate thread and are scheduled with fixed delay.
\- Added support for event batching via the event processor.
\- Events generated by methods like \`Activate\`, \`Track\`, and \`IsFeatureEnabled\` will be held in a queue until the configured batch size is reached, or the configured flush interval has elapsed. Then, they will be combined into a request and sent to the event dispatcher.
\- To configure event batching, set the \`MaxEventBatchSize\` and \`MaxEventFlushInterval\` properties in the \`OptimizelyFactory\` using \`OptimizelyFactory.SetBatchSize(int batchSize)\` and \`OptimizelyFactory.SetFlushInterval(TimeSpan flushInterval)\` and then creating using \`OptimizelyFactory.NewDefaultInstance\`.
\- Event batching is enabled by default. \`eventBatchSize\` defaults to \`10\`. \`eventFlushInterval\` defaults to \`30000\` milliseconds.
\- Updated the \`Dispose\` method representing the process of closing the instance. When \`Dispose\` is called, any events waiting to be sent as part of a batched event request will be immediately batched and sent to the event dispatcher.
\- If any such requests were sent to the event dispatcher, \`Stop\` waits for provided \`TimeoutInterval\` before stoping, so that events get successfully dispatched.
\- \`OptimizelyFactory\` now provides support of setting configuration variables from **\*App.config**\*, User will now be able to provide configuration variables of \`HttpConfigManager\` and \`BatchEventProcessor\` in **\*App.config**\*. Steps of usage are provided in \[README.md]\([https://github.com/optimizely/csharp-sdk#using-appconfig-in-optimizelyfactory](https://github.com/optimizely/csharp-sdk#using-appconfig-in-optimizelyfactory)).

\### Deprecated
\- \`EventBuilder\` was deprecated and now we will be using \`UserEventFactory\` and \`EventFactory\` to create LogEvent Object.
\- Deprecated \`Track\` notifications in favor of explicit \`LogEvent\` notification.
\- New features will no longer be supported on \`.net standard 1.6\` and \`.net 3.5\`

[https://github.com/optimizely/csharp-sdk/releases/tag/v3.3.0](https://github.com/optimizely/csharp-sdk/releases/tag/v3.3.0)