diff --git a/samples/feature/Core_9/Sample/CustomLogger.cs b/samples/feature/Core_9/Sample/CustomLogger.cs
index a931b13d8e1..2b0517bfde4 100644
--- a/samples/feature/Core_9/Sample/CustomLogger.cs
+++ b/samples/feature/Core_9/Sample/CustomLogger.cs
@@ -18,7 +18,7 @@ public IDisposable StartTimer(string name)
     public void WriteSaga(IContainSagaData sagaData)
     {
         var serialized = JsonSerializer.Serialize(sagaData, options);
-        log.Warn($"Saga State: \r\n{serialized}");
+        log.WarnFormat("Saga State: \n{0}", serialized);
     }
 
     class Log :
@@ -35,7 +35,7 @@ public Log(string name)
 
         public void Dispose()
         {
-            log.Warn($"{name} took {stopwatch.ElapsedMilliseconds}ms to process");
+            log.WarnFormat("{0} took {1}ms to process", name, stopwatch.ElapsedMilliseconds);
         }
     }
 }
diff --git a/samples/feature/Core_9/Sample/Handler/Handler1.cs b/samples/feature/Core_9/Sample/Handler/Handler1.cs
index 96c7e733305..5fc38db2340 100644
--- a/samples/feature/Core_9/Sample/Handler/Handler1.cs
+++ b/samples/feature/Core_9/Sample/Handler/Handler1.cs
@@ -12,7 +12,7 @@ public class Handler1 :
     public Task Handle(HandlerMessage message, IMessageHandlerContext context)
     {
         var milliseconds = random.Next(100, 1000);
-        log.Info($"HandlerMessage received going to Task.Delay({milliseconds}ms)");
+        log.InfoFormat("HandlerMessage received going to Task.Delay({0}ms)", milliseconds);
         return Task.Delay(milliseconds, context.CancellationToken);
     }
 }
diff --git a/samples/feature/Core_9/Sample/Handler/Handler2.cs b/samples/feature/Core_9/Sample/Handler/Handler2.cs
index 4365c3107e3..06f4397c358 100644
--- a/samples/feature/Core_9/Sample/Handler/Handler2.cs
+++ b/samples/feature/Core_9/Sample/Handler/Handler2.cs
@@ -12,7 +12,7 @@ public class Handler2 :
     public Task Handle(HandlerMessage message, IMessageHandlerContext context)
     {
         var milliseconds = random.Next(100, 1000);
-        log.Info($"HandlerMessage received going to Task.Delay({milliseconds}ms)");
+        log.InfoFormat("HandlerMessage received going to Task.Delay({0}ms)", milliseconds);
         return Task.Delay(milliseconds, context.CancellationToken);
     }
 }
diff --git a/samples/feature/Core_9/Sample/Handler/HandlerTimerBehavior.cs b/samples/feature/Core_9/Sample/Handler/HandlerTimerBehavior.cs
index f60d43e8973..8d31443407f 100644
--- a/samples/feature/Core_9/Sample/Handler/HandlerTimerBehavior.cs
+++ b/samples/feature/Core_9/Sample/Handler/HandlerTimerBehavior.cs
@@ -3,16 +3,9 @@
 using NServiceBus.Pipeline;
 
 #region HandlerTimerBehavior
-class HandlerTimerBehavior :
+class HandlerTimerBehavior(CustomLogger logger) :
     Behavior<IInvokeHandlerContext>
 {
-    CustomLogger logger;
-
-    public HandlerTimerBehavior(CustomLogger logger)
-    {
-        this.logger = logger;
-    }
-
     public override async Task Invoke(IInvokeHandlerContext context, Func<Task> next)
     {
         var handlerName = context.MessageHandler.Instance.GetType().Name;
diff --git a/samples/feature/Core_9/Sample/Saga/SagaStateAuditBehavior.cs b/samples/feature/Core_9/Sample/Saga/SagaStateAuditBehavior.cs
index 798b38ccc85..fee883efa7e 100644
--- a/samples/feature/Core_9/Sample/Saga/SagaStateAuditBehavior.cs
+++ b/samples/feature/Core_9/Sample/Saga/SagaStateAuditBehavior.cs
@@ -4,16 +4,9 @@
 using NServiceBus.Sagas;
 
 #region SagaStateAuditBehavior
-class SagaStateAuditBehavior :
+class SagaStateAuditBehavior(CustomLogger logger) :
     Behavior<IInvokeHandlerContext>
 {
-    CustomLogger logger;
-
-    public SagaStateAuditBehavior(CustomLogger logger)
-    {
-        this.logger = logger;
-    }
-
     public override async Task Invoke(IInvokeHandlerContext context, Func<Task> next)
     {
         await next();
diff --git a/samples/feature/sample.md b/samples/feature/sample.md
index 6b4c2f23e90..d815986b42d 100644
--- a/samples/feature/sample.md
+++ b/samples/feature/sample.md
@@ -1,7 +1,7 @@
 ---
 title: Building a custom feature
 summary: How to build a custom feature in NServiceBus
-reviewed: 2022-06-01
+reviewed: 2024-12-19
 component: Core
 related:
 - nservicebus/pipeline