diff --git a/ClipCMD/ClipboardManager.cs b/ClipCMD/ClipboardManager.cs
index 32319cc..db374d5 100644
--- a/ClipCMD/ClipboardManager.cs
+++ b/ClipCMD/ClipboardManager.cs
@@ -10,8 +10,7 @@ public class ClipboardManager
 
     public ClipboardManager(Window windowSource)
     {
-        HwndSource? source = PresentationSource.FromVisual(windowSource) as HwndSource;
-        if (source == null)
+        if (PresentationSource.FromVisual(windowSource) is not HwndSource source)
         {
             throw new ArgumentException(
                 "Window source MUST be initialized first, such as in the Window's OnSourceInitialized handler."