Adding SampleID to the SDK Helper

MicrosoftGraphAspNetCoreConnectSample/Helpers/GraphSDKHelper.cs

@@ -31,6 +31,9 @@ public GraphServiceClient GetAuthenticatedClient(string userId)
 
                     // Append the access token to the request
                     requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
+
+                    // This header identifies the sample in the Microsoft Graph service. If extracting this code for your project please remove.
+                    requestMessage.Headers.Add("SampleID", "aspnetcore-connect-sample");
                 }));
 
             return _graphClient;