Merge pull request #291237 from maud-lv/ml-ffdotnetbackground2

Add Entra ID to quickstart-feature-flag-dotnet-background-service.md

Author: prmerger-automator[bot]

articles/azure-app-configuration/quickstart-feature-flag-dotnet-background-service.md

@@ -9,7 +9,7 @@ ms.devlang: csharp
 ms.custom: devx-track-csharp, mode-other, devx-track-dotnet
 ms.topic: quickstart
 ms.tgt_pltfrm: .NET
-ms.date: 2/19/2024
+ms.date: 12/17/2024
 ms.author: zhiyuanliang
 #Customer intent: As a .NET background service developer, I want to use feature flags to control feature availability quickly and confidently.
 ---
@@ -52,10 +52,35 @@ Add a feature flag called *Beta* to the App Configuration store and leave **Labe
 
 1. Add a call to the `UseFeatureFlags` method inside the `AddAzureAppConfiguration` call and register feature management services.
 
+    ### [Microsoft Entra ID (recommended)](#tab/entra-id)
+
     ```csharp
     // Existing code in Program.cs
     // ... ...
+    builder.Configuration.AddAzureAppConfiguration(options =>
+    {
+        string endpoint = Environment.GetEnvironmentVariable("Endpoint"); 
+        options.Connect(new Uri(endpoint), new DefaultAzureCredential());
+
+        // Use feature flags
+        options.UseFeatureFlags();
 
+        // Register the refresher so that the Worker service can consume it through dependency injection
+        builder.Services.AddSingleton(options.GetRefresher());
+    });
+
+    // Register feature management services
+    builder.Services.AddFeatureManagement();
+
+    // The rest of existing code in Program.cs
+    // ... ...
+    ```
+
+    ### [Connection string](#tab/connection-string)
+
+    ```csharp
+    // Existing code in Program.cs
+    // ... ...
     builder.Configuration.AddAzureAppConfiguration(options =>
     {
         options.Connect(Environment.GetEnvironmentVariable("ConnectionString"));
@@ -73,6 +98,7 @@ Add a feature flag called *Beta* to the App Configuration store and leave **Labe
     // The rest of existing code in Program.cs
     // ... ...
     ```
+    ---
 
     > [!TIP]
     > When no parameter is passed to the `UseFeatureFlags` method, it loads *all* feature flags with *no label* in your App Configuration store. The default refresh interval of feature flags is 30 seconds. You can customize this behavior via the `FeatureFlagOptions` parameter. For example, the following code snippet loads only feature flags that start with *TestApp:* in their *key name* and have the label *dev*. The code also changes the refresh interval time to 5 minutes. Note that this refresh interval time is separate from that for regular key-values.