Rewrote without null conditional assignment

Author: Avid29

components/Extensions/src/ListViewBase/ListViewExtensions.AlternateRows.cs

@@ -194,6 +194,9 @@ private static void SetItemContainerBackground(ListViewBase sender, Control item
         var rootBorder = itemContainer.FindDescendant<Border>();
 
         itemContainer.Background = brush;
-        rootBorder?.Background = brush;
+        if (rootBorder is not null)
+        {
+            rootBorder.Background = brush;
+        }
     }
 }