Prepare feature management docs for 2.0-preview release.

Author: jimmyca15

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

@@ -82,8 +82,8 @@ Add the [Secret Manager tool](https://docs.microsoft.com/aspnet/core/security/ap
 1. Add reference to the `Microsoft.Azure.AppConfiguration.AspNetCore` and the `Microsoft.FeatureManagement.AspNetCore` NuGet packages by running the following commands:
 
     ```
-    dotnet add package Microsoft.Azure.AppConfiguration.AspNetCore --version 2.0.0-preview-009470001-12
-    dotnet add package Microsoft.FeatureManagement.AspNetCore --version 1.0.0-preview-009000001-1251
+    dotnet add package Microsoft.Azure.AppConfiguration.AspNetCore --version {tbd}
+    dotnet add package Microsoft.FeatureManagement.AspNetCore --version {tbd}
     ```
 
 1. Run the following command to restore packages for your project:

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

@@ -64,25 +64,33 @@ The .NET Feature Management libraries extend the framework with comprehensive fe
 1. Update the `Main` method to connect to App Configuration, specifying the `UseFeatureFlags` option so that feature flags are retrieved. Then display a message if the `Beta` feature flag is enabled.
 
     ```csharp
-        static void Main(string[] args)
+        public static void Main(string[] args)
+        {
+            AsyncMain().Wait();
+        }
+
+        private static async Task AsyncMain()
         {
             IConfigurationRoot configuration = new ConfigurationBuilder()
-                .AddAzureAppConfiguration(options => 
-                { 
+                .AddAzureAppConfiguration(options =>
+                {
                     options.Connect(Environment.GetEnvironmentVariable("ConnectionString"))
-                           .UseFeatureFlags(); 
+                           .UseFeatureFlags();
                 }).Build();
-            
-            IServiceCollection services = new ServiceCollection(); 
-            services.AddSingleton<IConfiguration>(configuration).AddFeatureManagement(); 
-            IFeatureManager featureManager = services.BuildServiceProvider().GetRequiredService<IFeatureManager>(); 
-            
-            if (featureManager.IsEnabled("Beta")) 
-            { 
-                Console.WriteLine("Welcome to the beta"); 
-            }
 
-            Console.WriteLine("Hello World!");
+            IServiceCollection services = new ServiceCollection();
+
+            services.AddSingleton<IConfiguration>(configuration).AddFeatureManagement();
+
+            using (ServiceProvider serviceProvider = services.BuildServiceProvider())
+            {
+                IFeatureManager featureManager = serviceProvider.GetRequiredService<IFeatureManager>();
+
+                if (await featureManager.IsEnabledAsync("Beta"))
+                {
+                    Console.WriteLine("Welcome to the beta!");
+                }
+            }
         }
     ```
 

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

@@ -175,7 +175,7 @@ The basic pattern of feature management is to first check if a feature flag is s
 ```csharp
 IFeatureManager featureManager;
 ...
-if (featureManager.IsEnabled(nameof(MyFeatureFlags.FeatureA)))
+if (await featureManager.IsEnabled(nameof(MyFeatureFlags.FeatureA)))
 {
     // Run the following code
 }
@@ -252,7 +252,7 @@ The feature `<feature>` tag can also be used to show content if any or all featu
 
 ## MVC filters
 
-You can set up MVC filters so that they're activated based on the state of a feature flag. The following code adds an MVC filter named `SomeMvcFilter`. This filter is triggered within the MVC pipeline only if `FeatureA` is enabled.
+You can set up MVC filters so that they're activated based on the state of a feature flag. The following code adds an MVC filter named `SomeMvcFilter`. This filter is triggered within the MVC pipeline only if `FeatureA` is enabled. This capability is limited to `IAsyncActionFilter`. 
 
 ```csharp
 using Microsoft.FeatureManagement.FeatureFilters;
@@ -267,16 +267,6 @@ public void ConfigureServices(IServiceCollection services)
 }
 ```
 
-## Routes
-
-You can use feature flags to dynamically expose routes. The following code adds a route, which sets `Beta` as the default controller only when `FeatureA` is enabled:
-
-```csharp
-app.UseMvc(routes => {
-    routes.MapRouteForFeature(nameof(MyFeatureFlags.FeatureA), "betaDefault", "{controller=Beta}/{action=Index}/{id?}");
-});
-```
-
 ## Middleware
 
 You can also use feature flags to conditionally add application branches and middleware. The following code inserts a middleware component in the request pipeline only when `FeatureA` is enabled: