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[FSSDK-11956] CMAB Release C# (#396)
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‎CHANGELOG.md‎

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# Optimizely C# SDK Changelog
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## 4.2.0
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Nov 13, 2025
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### New Features
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- **Added support for Contextual Multi-Armed Bandit (CMAB)**: Added support for CMAB experiments(Contextual Bandits rules) with new configuration options and cache control. To get decision from CMAB rules, `decide` and related methods must be used.
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#### CMAB Configuration Options
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The following new configuration options have been added for CMAB:
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```csharp
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using OptimizelySDK;
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// Configure CMAB settings before creating the Optimizely instance
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var cmabConfig = new CmabConfig()
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.SetCacheSize(1000) // Optional: Set CMAB cache size (default: 1000)
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.SetCacheTtl(TimeSpan.FromMinutes(30)); // Optional: Set CMAB cache TTL (default: 30 minutes)
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// .SetCache(customCache) // Optional: Custom cache implementation
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OptimizelyFactory.SetCmabConfig(cmabConfig);
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var optimizely = OptimizelyFactory.NewDefaultInstance("SDK_KEY_HERE");
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```
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#### CMAB-Related OptimizelyDecideOptions
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New decide options are available to control CMAB caching behavior:
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- `OptimizelyDecideOption.IGNORE_CMAB_CACHE`: Bypass CMAB cache for fresh decisions
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- `OptimizelyDecideOption.RESET_CMAB_CACHE`: Clear and reset CMAB cache before making decisions
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- `OptimizelyDecideOption.INVALIDATE_USER_CMAB_CACHE`: Invalidate CMAB cache for the particular user and experiment
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```csharp
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using OptimizelySDK.OptimizelyDecisions;
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// Example usage with CMAB decide options
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var user = optimizely.CreateUserContext("user123");
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var decision = user.Decide("feature-flag-key", new[]
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{
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OptimizelyDecideOption.IGNORE_CMAB_CACHE
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});
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```
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## 4.1.0
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November 7th, 2024
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‎OptimizelySDK.DemoApp/Properties/AssemblyInfo.cs‎

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//
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// You can specify all the values or you can default the Revision and Build Numbers
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// by using the '*' as shown below:
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[assembly: AssemblyVersion("4.1.0.0")]
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[assembly: AssemblyFileVersion("4.1.0.0")]
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[assembly: AssemblyInformationalVersion("4.1.0")] // Used by NuGet.
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[assembly: AssemblyVersion("4.2.0.0")]
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[assembly: AssemblyFileVersion("4.2.0.0")]
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[assembly: AssemblyInformationalVersion("4.2.0")] // Used by NuGet.

‎OptimizelySDK.Net35/Properties/AssemblyInfo.cs‎

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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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[assembly: AssemblyVersion("4.1.0.0")]
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[assembly: AssemblyFileVersion("4.1.0.0")]
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[assembly: AssemblyInformationalVersion("4.1.0")] // Used by NuGet.
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[assembly: AssemblyVersion("4.2.0.0")]
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[assembly: AssemblyFileVersion("4.2.0.0")]
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[assembly: AssemblyInformationalVersion("4.2.0")] // Used by NuGet.

‎OptimizelySDK.Net40/Properties/AssemblyInfo.cs‎

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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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[assembly: AssemblyVersion("4.1.0.0")]
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[assembly: AssemblyFileVersion("4.1.0.0")]
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[assembly: AssemblyInformationalVersion("4.1.0")] // Used by NuGet.
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[assembly: AssemblyVersion("4.2.0.0")]
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[assembly: AssemblyFileVersion("4.2.0.0")]
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[assembly: AssemblyInformationalVersion("4.2.0")] // Used by NuGet.

‎OptimizelySDK.NetStandard16/Properties/AssemblyInfo.cs‎

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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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[assembly: AssemblyVersion("4.1.0")]
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[assembly: AssemblyFileVersion("4.1.0.0")]
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[assembly: AssemblyInformationalVersion("4.1.0")] // Used by NuGet.
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[assembly: AssemblyVersion("4.2.0")]
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[assembly: AssemblyFileVersion("4.2.0.0")]
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[assembly: AssemblyInformationalVersion("4.2.0")] // Used by NuGet.

‎OptimizelySDK.NetStandard20/Properties/AssemblyInfo.cs‎

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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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[assembly: AssemblyVersion("4.1.0.0")]
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[assembly: AssemblyFileVersion("4.1.0.0")]
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[assembly: AssemblyInformationalVersion("4.1.0")] // Used by NuGet.
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[assembly: AssemblyVersion("4.2.0.0")]
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[assembly: AssemblyFileVersion("4.2.0.0")]
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[assembly: AssemblyInformationalVersion("4.2.0")] // Used by NuGet.

‎OptimizelySDK.Tests/Properties/AssemblyInfo.cs‎

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//
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// You can specify all the values or you can default the Revision and Build Numbers
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// by using the '*' as shown below:
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[assembly: AssemblyVersion("4.1.0.0")]
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[assembly: AssemblyFileVersion("4.1.0.0")]
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[assembly: AssemblyInformationalVersion("4.1.0")] // Used by NuGet.
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[assembly: AssemblyVersion("4.2.0.0")]
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[assembly: AssemblyFileVersion("4.2.0.0")]
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[assembly: AssemblyInformationalVersion("4.2.0")] // Used by NuGet.

‎OptimizelySDK/Properties/AssemblyInfo.cs‎

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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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[assembly: AssemblyVersion("4.1.0.0")]
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[assembly: AssemblyFileVersion("4.1.0.0")]
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[assembly: AssemblyInformationalVersion("4.1.0")] // Used by NuGet.
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[assembly: AssemblyVersion("4.2.0.0")]
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[assembly: AssemblyFileVersion("4.2.0.0")]
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[assembly: AssemblyInformationalVersion("4.2.0")] // Used by NuGet.

‎README.md‎

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```
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<configSections>
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<section name="optlySDKConfigSection"
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type="OptimizelySDK.OptimizelySDKConfigSection, OptimizelySDK, Version=4.1.0.0, Culture=neutral, PublicKeyToken=null" />
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type="OptimizelySDK.OptimizelySDKConfigSection, OptimizelySDK, Version=4.2.0.0, Culture=neutral, PublicKeyToken=null" />
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</configSections>
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```
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2. Now add **optlySDKConfigSection** below **<configSections>**. In this section you can add and set following **HttpProjectConfigManager** and **BatchEventProcessor** variables:

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