diff --git a/src/samples/aspnet/Elsa.Samples.AspNet.MassTransitActivities/Elsa.Samples.AspNet.MassTransitActivities.csproj b/src/samples/aspnet/Elsa.Samples.AspNet.MassTransitActivities/Elsa.Samples.AspNet.MassTransitActivities.csproj
index 6406236ea..6241d130a 100644
--- a/src/samples/aspnet/Elsa.Samples.AspNet.MassTransitActivities/Elsa.Samples.AspNet.MassTransitActivities.csproj
+++ b/src/samples/aspnet/Elsa.Samples.AspNet.MassTransitActivities/Elsa.Samples.AspNet.MassTransitActivities.csproj
@@ -8,6 +8,7 @@
 
     <ItemGroup>
         <ProjectReference Include="..\..\..\bundles\Elsa\Elsa.csproj" />
+        <ProjectReference Include="..\..\..\modules\Elsa.CSharp\Elsa.CSharp.csproj" />
         <ProjectReference Include="..\..\..\modules\Elsa.EntityFrameworkCore\Elsa.EntityFrameworkCore.csproj" />
         <ProjectReference Include="..\..\..\modules\Elsa.Http\Elsa.Http.csproj" />
         <ProjectReference Include="..\..\..\modules\Elsa.Identity\Elsa.Identity.csproj" />
diff --git a/src/samples/aspnet/Elsa.Samples.AspNet.MassTransitActivities/Program.cs b/src/samples/aspnet/Elsa.Samples.AspNet.MassTransitActivities/Program.cs
index b68fa11ab..5ba3ecd92 100644
--- a/src/samples/aspnet/Elsa.Samples.AspNet.MassTransitActivities/Program.cs
+++ b/src/samples/aspnet/Elsa.Samples.AspNet.MassTransitActivities/Program.cs
@@ -29,8 +29,25 @@ builder.Services.AddElsa(elsa =>
     // Add services for HTTP activities and workflow middleware.
     elsa.UseHttp();
     
-    // Use JavaScript and Liquid.
-    elsa.UseJavaScript();
+    // Use JavaScript.
+    elsa.UseJavaScript(javaScript =>
+    {
+        javaScript.AllowClrAccess = true;
+        javaScript.ConfigureEngine(options =>
+        {
+            options.RegisterType<OrderCompleted>();
+            options.RegisterType<OrderCreated>();
+        });
+    });
+    
+    // Use C#.
+    elsa.UseCSharp(csharp =>
+    {
+        csharp.Assemblies.Add(typeof(OrderCreated).Assembly);
+        csharp.Namespaces.Add(typeof(OrderCreated).Namespace!);
+    });
+    
+    // Use Liquid.
     elsa.UseLiquid();
     
     // Configure identity so that we can create a default admin user.