diff --git a/OpenMcdf.Perf/Program.cs b/OpenMcdf.Perf/Program.cs
index c49534f..f1f54a9 100644
--- a/OpenMcdf.Perf/Program.cs
+++ b/OpenMcdf.Perf/Program.cs
@@ -39,7 +39,7 @@ public static void MultiStorageAndStreamWrite()
         int writeCount = 1024;
         byte[] buffer = new byte[32 * 512];
 
-        Microsoft.IO.RecyclableMemoryStreamManager manager = new ();
+        Microsoft.IO.RecyclableMemoryStreamManager manager = new();
         Microsoft.IO.RecyclableMemoryStream baseStream = new(manager);
         baseStream.Capacity = 2 * (storageCount * buffer.Length * writeCount + storageCount * (streamCount - 1) * buffer.Length);
 
diff --git a/OpenMcdf/DirectoryTree.cs b/OpenMcdf/DirectoryTree.cs
index 26620cc..cf2d605 100644
--- a/OpenMcdf/DirectoryTree.cs
+++ b/OpenMcdf/DirectoryTree.cs
@@ -107,15 +107,15 @@ public void Add(DirectoryEntry entry)
             return;
         }
 
-        uint previous = currentEntry!.LeftSiblingId;
-        uint next = currentEntry.RightSiblingId;
-
         while (true)
         {
-            int compare = DirectoryEntryComparer.Compare(entry.NameCharSpan, currentEntry!.NameCharSpan);
+            uint leftId = currentEntry!.LeftSiblingId;
+            uint rightId = currentEntry.RightSiblingId;
+
+            int compare = DirectoryEntryComparer.Compare(entry.NameCharSpan, currentEntry.NameCharSpan);
             if (compare < 0)
             {
-                if (previous == StreamId.NoStream)
+                if (leftId == StreamId.NoStream)
                 {
                     currentEntry.LeftSiblingId = entry.Id;
                     directories.Write(currentEntry);
@@ -123,11 +123,11 @@ public void Add(DirectoryEntry entry)
                     return;
                 }
 
-                currentEntry = directories.GetDictionaryEntry(previous);
+                currentEntry = directories.GetDictionaryEntry(leftId);
             }
             else if (compare > 0)
             {
-                if (next == StreamId.NoStream)
+                if (rightId == StreamId.NoStream)
                 {
                     currentEntry.RightSiblingId = entry.Id;
                     directories.Write(currentEntry);
@@ -135,15 +135,12 @@ public void Add(DirectoryEntry entry)
                     return;
                 }
 
-                currentEntry = directories.GetDictionaryEntry(next);
+                currentEntry = directories.GetDictionaryEntry(rightId);
             }
             else
             {
                 throw new IOException($"{entry.Type} \"{entry.NameString}\" already exists.");
             }
-
-            previous = currentEntry!.LeftSiblingId;
-            next = currentEntry!.RightSiblingId;
         }
     }
 
@@ -209,6 +206,7 @@ internal void WriteTrace(TextWriter writer)
         WriteTrace(writer, current, 0);
     }
 
+    [ExcludeFromCodeCoverage]
     void WriteTrace(TextWriter writer, DirectoryEntry entry, int indent)
     {
         directories.TryGetDictionaryEntry(entry.RightSiblingId, out DirectoryEntry? rightSibling);
diff --git a/OpenMcdf/Storage.cs b/OpenMcdf/Storage.cs
index eb1ebb9..a512b89 100644
--- a/OpenMcdf/Storage.cs
+++ b/OpenMcdf/Storage.cs
@@ -125,7 +125,7 @@ public bool TryOpenStorage(string name, [MaybeNullWhen(false)] out Storage? stor
 
         this.ThrowIfDisposed(Context.IsDisposed);
 
-        directoryTree.TryGetDirectoryEntry(name,  out DirectoryEntry? entry);
+        directoryTree.TryGetDirectoryEntry(name, out DirectoryEntry? entry);
         if (entry is null || entry.Type is not StorageType.Storage)
         {
             storage = null;
diff --git a/StructuredStorageExplorer/MainForm.cs b/StructuredStorageExplorer/MainForm.cs
index 20c6541..5ba64e8 100644
--- a/StructuredStorageExplorer/MainForm.cs
+++ b/StructuredStorageExplorer/MainForm.cs
@@ -1,7 +1,7 @@
 #define OLE_PROPERTY
 
-using OpenMcdf.Ole;
 using OpenMcdf;
+using OpenMcdf.Ole;
 using StructuredStorageExplorer.Properties;
 using System.Collections;
 using System.ComponentModel;