diff --git a/WpfViewModelFirst/Part1/Part1ViewModel.cs b/WpfViewModelFirst/Part1/Part1ViewModel.cs
index fac161b..b9f4bd9 100644
--- a/WpfViewModelFirst/Part1/Part1ViewModel.cs
+++ b/WpfViewModelFirst/Part1/Part1ViewModel.cs
@@ -14,13 +14,13 @@ namespace WpfViewModelFirst.Part1
         public Part1ViewModel(Func<Task> finishAction)
         {
             _finishAction = finishAction;
-            FinishCommand = new CustomCommand(o => Finish(o));
+            FinishCommand = new CustomCommand(Finish);
         }
 
         public ICommand FinishCommand { get; set; }
-        private Task Finish(object? e)
+        private void Finish(object? e)
         {
-            return _finishAction.Invoke();
+            _finishAction.Invoke();
         }
     }
 }