diff --git a/src/EditorFeatures/TestUtilities/Workspaces/TestWorkspace_XmlConsumption.cs b/src/EditorFeatures/TestUtilities/Workspaces/TestWorkspace_XmlConsumption.cs
index 7fef27d3bfcdd1b05ec35899631a1ad4eb929b99..e98127a87eb08f29c2d1fb8d7cadf9c8943f0306 100644
--- a/src/EditorFeatures/TestUtilities/Workspaces/TestWorkspace_XmlConsumption.cs
+++ b/src/EditorFeatures/TestUtilities/Workspaces/TestWorkspace_XmlConsumption.cs
@@ -85,7 +85,7 @@ public static TestWorkspace Create(string xmlDefinition, bool completed = true,
                 throw new ArgumentException();
             }
 
-            exportProvider = exportProvider ?? TestExportProvider.ExportProviderWithCSharpAndVisualBasic;
+            exportProvider ??= TestExportProvider.ExportProviderWithCSharpAndVisualBasic;
 
             var workspace = new TestWorkspace(exportProvider, workspaceKind);
 
diff --git a/src/VisualStudio/CSharp/Test/Interactive/Commands/ResetInteractiveTests.cs b/src/VisualStudio/CSharp/Test/Interactive/Commands/ResetInteractiveTests.cs
index 001636f0168a1bc358cfb64568fb89e28b9dbeca..ca8bd64a225e5e41ba83191933b3056b2dfdf407 100644
--- a/src/VisualStudio/CSharp/Test/Interactive/Commands/ResetInteractiveTests.cs
+++ b/src/VisualStudio/CSharp/Test/Interactive/Commands/ResetInteractiveTests.cs
@@ -63,8 +63,8 @@ public async Task TestResetREPLWithProjectContext()
             List<string> expectedReferences = null,
             List<string> expectedUsings = null)
         {
-            expectedReferences = expectedReferences ?? new List<string>();
-            expectedUsings = expectedUsings ?? new List<string>();
+            expectedReferences ??= new List<string>();
+            expectedUsings ??= new List<string>();
 
             var testHost = new InteractiveWindowTestHost(workspace.ExportProvider);
             var executedSubmissionCalls = new List<string>();
diff --git a/src/VisualStudio/Core/Def/Implementation/Remote/RemoteHostClientServiceFactory.SolutionChecksumUpdater.cs b/src/VisualStudio/Core/Def/Implementation/Remote/RemoteHostClientServiceFactory.SolutionChecksumUpdater.cs
index c600067c4d8d3678e23d6b58ca179e5ac8edc765..879ba4fb93d0fc3314122bbc963c6f75f331b9a0 100644
--- a/src/VisualStudio/Core/Def/Implementation/Remote/RemoteHostClientServiceFactory.SolutionChecksumUpdater.cs
+++ b/src/VisualStudio/Core/Def/Implementation/Remote/RemoteHostClientServiceFactory.SolutionChecksumUpdater.cs
@@ -111,7 +111,7 @@ private void EnqueueChecksumUpdate()
 
                 lock (_gate)
                 {
-                    _lastToken = _lastToken ?? Listener.BeginAsyncOperation(nameof(SolutionChecksumUpdater));
+                    _lastToken ??= Listener.BeginAsyncOperation(nameof(SolutionChecksumUpdater));
                 }
 
                 _event.Release();
diff --git a/src/VisualStudio/Core/Impl/CodeModel/AbstractCodeModelService.cs b/src/VisualStudio/Core/Impl/CodeModel/AbstractCodeModelService.cs
index 34fed5a4434a8fea6704e0d51761428ab45cba06..4ba25679a24a828bd32a3d3ca73082e409456fdf 100644
--- a/src/VisualStudio/Core/Impl/CodeModel/AbstractCodeModelService.cs
+++ b/src/VisualStudio/Core/Impl/CodeModel/AbstractCodeModelService.cs
@@ -592,7 +592,7 @@ protected EnvDTE.vsCMElement GetElementKind(ITypeSymbol typeSymbol)
             {
                 if (location.IsInSource)
                 {
-                    compilation = compilation ?? project.GetCompilationAsync(CancellationToken.None).WaitAndGetResult_CodeModel(CancellationToken.None);
+                    compilation ??= project.GetCompilationAsync(CancellationToken.None).WaitAndGetResult_CodeModel(CancellationToken.None);
 
                     if (compilation.ContainsSyntaxTree(location.SourceTree))
                     {
@@ -606,7 +606,7 @@ protected EnvDTE.vsCMElement GetElementKind(ITypeSymbol typeSymbol)
                         }
                         else
                         {
-                            generatedCode = generatedCode ?? Tuple.Create(document.Id, location);
+                            generatedCode ??= Tuple.Create(document.Id, location);
                         }
                     }
                 }
diff --git a/src/VisualStudio/Core/Impl/CodeModel/FileCodeModel.cs b/src/VisualStudio/Core/Impl/CodeModel/FileCodeModel.cs
index e693d0f19956fa781c06cfa35ed4bdf2bb41ed35..184b53d8ea1d945efd38999855156332ce61d24f 100644
--- a/src/VisualStudio/Core/Impl/CodeModel/FileCodeModel.cs
+++ b/src/VisualStudio/Core/Impl/CodeModel/FileCodeModel.cs
@@ -673,7 +673,7 @@ int IVBFileCodeModelEvents.EndEdit()
                             var node = element.LookupNode();
                             if (node != null)
                             {
-                                elementAndPaths = elementAndPaths ?? new List<ValueTuple<AbstractKeyedCodeElement, SyntaxPath>>();
+                                elementAndPaths ??= new List<ValueTuple<AbstractKeyedCodeElement, SyntaxPath>>();
                                 elementAndPaths.Add(ValueTuple.Create(element, new SyntaxPath(node)));
                             }
                         }
diff --git a/src/Workspaces/Remote/Core/Services/SolutionCreator.cs b/src/Workspaces/Remote/Core/Services/SolutionCreator.cs
index b6bf8d490305b17aaa9e44ed8eb3a057de9a221a..3371803cc377281d6785c5c50664e45e3067516f 100644
--- a/src/Workspaces/Remote/Core/Services/SolutionCreator.cs
+++ b/src/Workspaces/Remote/Core/Services/SolutionCreator.cs
@@ -313,7 +313,7 @@ private async Task<Project> UpdateProjectInfoAsync(Project project, Checksum inf
                 {
                     if (!oldMap.ContainsKey(kv.Key))
                     {
-                        documentsToAdd = documentsToAdd ?? ImmutableArray.CreateBuilder<DocumentInfo>();
+                        documentsToAdd ??= ImmutableArray.CreateBuilder<DocumentInfo>();
 
                         // we have new document added
                         var documentInfo = await SolutionInfoCreator.CreateDocumentInfoAsync(_assetService, kv.Value.Checksum, _cancellationToken).ConfigureAwait(false);