Update

Author: zhenlan

articles/azure-app-configuration/quickstart-aspnet-core-app.md

@@ -81,7 +81,7 @@ Connect to your App Configuration store using Microsoft Entra ID (recommended),
 
     ```dotnetcli
     dotnet user-secrets init
-    dotnet user-secrets set ConnectionStrings:AppConfig "<your_connection_string>"
+    dotnet user-secrets set ConnectionStrings:AppConfiguration "<your_connection_string>"
     ```
 
     > [!TIP]
@@ -118,15 +118,16 @@ Connect to your App Configuration store using Microsoft Entra ID (recommended),
     var builder = WebApplication.CreateBuilder(args); 
     
     // Retrieve the endpoint
-    string endpoint = builder.Configuration.GetValue<string>("Endpoints:AppConfiguration");
-    
+    string endpoint = builder.Configuration.GetValue<string>("Endpoints:AppConfiguration")
+        ?? throw new InvalidOperationException("The setting `Endpoints:AppConfiguration` was not found.");
+
     // Load configuration from Azure App Configuration 
     builder.Configuration.AddAzureAppConfiguration(options =>
     {
         options.Connect(new Uri(endpoint), new DefaultAzureCredential());
     });
     
-     // The rest of existing code in program.cs
+    // The rest of existing code in program.cs
     // ... ...    
     ```
 
@@ -136,7 +137,8 @@ Connect to your App Configuration store using Microsoft Entra ID (recommended),
     var builder = WebApplication.CreateBuilder(args);
 
     // Retrieve the connection string
-    string connectionString = builder.Configuration.GetConnectionString("AppConfig");
+    string connectionString = builder.Configuration.GetConnectionString("AppConfiguration")
+        ?? throw new InvalidOperationException("The connection string 'AppConfiguration' was not found.");
 
     // Load configuration from Azure App Configuration
     builder.Configuration.AddAzureAppConfiguration(connectionString);

articles/azure-app-configuration/use-variant-feature-flags-aspnet-core.md

@@ -28,7 +28,7 @@ In this tutorial, you use a variant feature flag to manage experiences for diffe
     dotnet new razor --auth Individual -o QuoteOfTheDay
     ```
 
-1. Create a [user secret](/aspnet/core/security/app-secrets) for the application by navigating into the *QuoteOfTheDay* folder and run the following commands. This secret holds the endpoint for your App Configuration store.
+1. Create a [user secret](/aspnet/core/security/app-secrets) for the application by navigating into the *QuoteOfTheDay* folder and run the following commands. Replace the `<Your App Configuration store endpoint>` placeholder with your App Configuration store's endpoint. You can find the endpoint in your App Configuration store's **Overview** blade in the Azure portal.
 
     ```dotnetcli
     dotnet user-secrets init
@@ -45,7 +45,7 @@ In this tutorial, you use a variant feature flag to manage experiences for diffe
 
 ## Connect to App Configuration for feature management
 
-1. Open *Program.cs*, and add the following using statements.
+1. Open *Program.cs* and add the following using statements.
 
     ```csharp
     using Azure.Identity;
@@ -61,7 +61,8 @@ In this tutorial, you use a variant feature flag to manage experiences for diffe
     var builder = WebApplication.CreateBuilder(args); 
 
     // Retrieve the endpoint
-    string endpoint = builder.Configuration.GetValue<string>("Endpoints:AppConfiguration");
+    string endpoint = builder.Configuration.GetValue<string>("Endpoints:AppConfiguration")
+        ?? throw new InvalidOperationException("The setting `Endpoints:AppConfiguration` was not found.");
 
     // Load configuration and feature flags from Azure App Configuration
     builder.Configuration