Addressing Lisa's feedback.

Author: jpconnock

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

@@ -49,9 +49,13 @@ Use the [.NET Core command-line interface (CLI)](https://docs.microsoft.com/dotn
 
 Add the [Secret Manager tool](https://docs.microsoft.com/aspnet/core/security/app-secrets) to your project. The Secret Manager tool stores sensitive data for development work outside your project tree. This approach helps prevent the accidental sharing of app secrets within source code.
 
+    > [!IMPORTANT]
+    > Significant differences exist between .NET Core 2.x and 3.x.  Select the correct syntax based on your environment.
+
 1. Open the *.csproj* file.
 1. Add a `UserSecretsId` element as shown in the following example, and replace its value with your own, which typically is a GUID:
 
+    #### [.NET Core 2.x](#tab/core2x)
     ```xml
     <Project Sdk="Microsoft.NET.Sdk.Web">
 
@@ -67,14 +71,25 @@ Add the [Secret Manager tool](https://docs.microsoft.com/aspnet/core/security/ap
 
     </Project>
     ```
+    #### [.NET Core 3.x](#tab/core3x)
+    ```xml
+    <Project Sdk="Microsoft.NET.Sdk.Web">
+    
+        <PropertyGroup>
+            <TargetFramework>netcoreapp3.1</TargetFramework>
+            <UserSecretsId>79a3edd0-2092-40a2-a04d-dcb46d5ca9ed</UserSecretsId>
+        </PropertyGroup>
+    </Project>
+    ```
+    ---
 
 ## Connect to an App Configuration store
 
 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 3.0.0-preview-011100002-1192
+    dotnet add package Microsoft.FeatureManagement.AspNetCore --version 2.0.0-preview-010610001-1263
     ```
 
 1. Run the following command to restore packages for your project:
@@ -150,28 +165,70 @@ Add the [Secret Manager tool](https://docs.microsoft.com/aspnet/core/security/ap
 
 1. Update the `ConfigureServices` method to add feature flag support by calling the `services.AddFeatureManagement()` method. Optionally, you can include any filter to be used with feature flags by calling `services.AddFeatureFilter<FilterType>()`:
 
+    #### [.NET Core 2.x](#tab/core2x)
     ```csharp
     public void ConfigureServices(IServiceCollection services)
     {
+        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);        
         services.AddFeatureManagement();
     }
     ```
+    #### [.NET Core 3.x](#tab/core3x)
+    ```csharp    
+    public void ConfigureServices(IServiceCollection services)
+    {
+        services.AddControllersWithViews();           services.AddFeatureManagement();
+    }
+    ---
 
 1. Update the `Configure` method to add a middleware to allow the feature flag values to be refreshed at a recurring interval while the ASP.NET Core web app continues to receive requests.
 
     #### [.NET Core 2.x](#tab/core2x)
     ```csharp
     public void Configure(IApplicationBuilder app, IHostingEnvironment env)
     {
-        app.UseAzureAppConfiguration();
-        app.UseMvc();
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+            else
+            {
+                app.UseExceptionHandler("/Home/Error");
+            }
+            
+            app.UseStaticFiles();
+            app.UseCookiePolicy();
+            app.UseAzureAppConfiguration();
+            app.UseMvc(routes =>
+            {
+                routes.MapRoute(
+                    name: "default",
+                    template: "{controller=Home}/{action=Index}/{id?}");
+            });
     }
     ```
     #### [.NET Core 3.x](#tab/core3x)
     ```csharp
     public void Configure(IApplicationBuilder app, IHostingEnvironment env)
     {
-        app.UseAzureAppConfiguration();
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+            else
+            {
+                app.UseExceptionHandler("/Home/Error");
+            }
+            app.UseStaticFiles();
+            app.UseRouting();
+            app.UseAuthorization();
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllerRoute(
+                    name: "default",
+                    pattern: "{controller=Home}/{action=Index}/{id?}");
+            });
+            app.UseAzureAppConfiguration();
     }
     ```
 ---