update code snippet using out of repo code reference

Author: kengaderdus

.openpublishing.publish.config.json

@@ -807,6 +807,12 @@
       "branch": "master",
       "branch_mapping": {}
     },
+    {  
+      "path_to_root": "ms-identity-dotnetcore-b2c-account-management",
+      "url": "https://github.com/Azure-Samples/ms-identity-dotnetcore-b2c-account-management",
+      "branch": "master",
+      "branch_mapping": {}
+    },
     {
       "path_to_root": "msdocs-python-flask-webapp-quickstart",
       "url": "https://github.com/Azure-Samples/msdocs-python-flask-webapp-quickstart",

articles/active-directory-b2c/microsoft-graph-operations.md

@@ -212,46 +212,11 @@ The `RunAsync` method in the _Program.cs_ file:
 1. Initializes the auth provider using [OAuth 2.0 client credentials grant](../active-directory/develop/v2-oauth2-client-creds-grant-flow.md) flow. With the client credentials grant flow, the app is able to get an access token to call the Microsoft Graph API.
 1. Sets up the Microsoft Graph service client with the auth provider:
 
-    ```csharp
-    // Read application settings from appsettings.json (tenant ID, app ID, client secret, etc.)
-    AppSettings config = AppSettingsFile.ReadFromJsonFile();
-
-    // Initialize the client credential auth provider
-    IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
-        .Create(config.AppId)
-        .WithTenantId(config.TenantId)
-        .WithClientSecret(config.ClientSecret)
-        .Build();
-    ClientCredentialProvider authProvider = new ClientCredentialProvider(confidentialClientApplication);
-
-    // Set up the Microsoft Graph service client with client credentials
-    GraphServiceClient graphClient = new GraphServiceClient(authProvider);
-    ```
+:::code language="csharp" source="~/ms-identity-dotnetcore-b2c-account-management/src/Program.cs" id="ms_docref_set_auth_provider":::
 
 The initialized *GraphServiceClient* is then used in _UserService.cs_ to perform the user management operations. For example, getting a list of the user accounts in the tenant:
 
-```csharp
-public static async Task ListUsers(GraphServiceClient graphClient)
-{
-    Console.WriteLine("Getting list of users...");
-
-    // Get all users (one page)
-    var result = await graphClient.Users
-        .Request()
-        .Select(e => new
-        {
-            e.DisplayName,
-            e.Id,
-            e.Identities
-        })
-        .GetAsync();
-
-    foreach (var user in result.CurrentPage)
-    {
-        Console.WriteLine(JsonConvert.SerializeObject(user));
-    }
-}
-```
+:::code language="csharp" source="~/ms-identity-dotnetcore-b2c-account-management/src/Services/UserService.cs" id="ms_docref_get_list_of_user_accounts":::
 
 [Make API calls using the Microsoft Graph SDKs](/graph/sdks/create-requests) includes information on how to read and write information from Microsoft Graph, use `$select` to control the properties returned, provide custom query parameters, and use the `$filter` and `$orderBy` query parameters.