diff --git a/src/Chapter01/Chapter01.csproj b/src/Chapter01/Chapter01.csproj
index e17d2c63b..bdd0f16e1 100644
--- a/src/Chapter01/Chapter01.csproj
+++ b/src/Chapter01/Chapter01.csproj
@@ -15,18 +15,15 @@
     <Compile Remove="HelloWorld\**" />
     <Compile Remove="Listing01.01.HelloWorldInC#.cs" />
     <Compile Remove="Listing01.01A.HelloWorldInC#.cs" />
-    <Compile Remove="Listing01.02.SampleNETCoreConsoleProjectFile.cs" />
     <Compile Remove="Listing01.20.SampleCILOutput.cs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <Compile Include="..\Shared\Program.cs">
       <Link>Program.cs</Link>
     </Compile>
   </ItemGroup>
   <ItemGroup>
     <None Include="Listing01.01.HelloWorldInC#.cs" />
-    <None Include="Listing01.02.SampleNETCoreConsoleProjectFile.cs" />
     <None Include="Listing01.20.SampleCILOutput.cs" />
   </ItemGroup>
 </Project>
diff --git a/src/Chapter01/Listing01.02.SampleNETCoreConsoleProjectFile.cs b/src/Chapter01/Listing01.02.SampleNETCoreConsoleProjectFile.cs
deleted file mode 100644
index 041166a8b..000000000
--- a/src/Chapter01/Listing01.02.SampleNETCoreConsoleProjectFile.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-#region INCLUDE
-<Project Sdk="Microsoft.NET.Sdk">
-    <PropertyGroup>
-        <OutputType>Exe</OutputType>
-        <TargetFramework>net7.0</TargetFramework>
-    </PropertyGroup>
-</Project>
-#endregion INCLUDE
\ No newline at end of file
diff --git a/src/Chapter01/Listing01.02.SampleNETCoreConsoleProjectFile.xml b/src/Chapter01/Listing01.02.SampleNETCoreConsoleProjectFile.xml
new file mode 100644
index 000000000..bc33a69c5
--- /dev/null
+++ b/src/Chapter01/Listing01.02.SampleNETCoreConsoleProjectFile.xml
@@ -0,0 +1,10 @@
+<!--#region INCLUDE-->
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+</Project>
+<!--#endregion INCLUDE-->
\ No newline at end of file
diff --git a/src/Chapter02/Chapter02.csproj b/src/Chapter02/Chapter02.csproj
index 551b0727e..dc2f38b17 100644
--- a/src/Chapter02/Chapter02.csproj
+++ b/src/Chapter02/Chapter02.csproj
@@ -12,7 +12,6 @@
   </PropertyGroup>
   <Import Project="..\Chapter.props" />
   <ItemGroup>
-    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <Compile Include="..\Shared\Program.cs">
       <Link>Program.cs</Link>
     </Compile>
diff --git a/src/Chapter03/Chapter03.csproj b/src/Chapter03/Chapter03.csproj
index c50dd10f2..79fa6b1d2 100644
--- a/src/Chapter03/Chapter03.csproj
+++ b/src/Chapter03/Chapter03.csproj
@@ -13,7 +13,6 @@
   <Import Project="..\Chapter.props" />
   <ItemGroup>
     <Compile Remove="Listing03.02.DereferencingAnUnassignedVariable.cs" />
-    <Compile Remove="Listing03.03.EnablingNullableProjectWide.cs" />
     <Compile Remove="Listing03.06.TheCSharpEquivalentOfCompilerGeneratedCILCodeForAValueTupleReturn.cs" />
   </ItemGroup>
   <ItemGroup>
@@ -25,7 +24,6 @@
     <None Include="Listing03.02.DereferencingAnUnassignedVariable.cs">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
-    <None Include="Listing03.03.EnablingNullableProjectWide.cs" />
     <None Include="Listing03.06.TheCSharpEquivalentOfCompilerGeneratedCILCodeForAValueTupleReturn.cs" />
   </ItemGroup>
 </Project>
diff --git a/src/Chapter03/Listing03.03.EnablingNullableProjectWide.cs b/src/Chapter03/Listing03.03.EnablingNullableProjectWide.xml
similarity index 79%
rename from src/Chapter03/Listing03.03.EnablingNullableProjectWide.cs
rename to src/Chapter03/Listing03.03.EnablingNullableProjectWide.xml
index b10370f05..e99fbfbee 100644
--- a/src/Chapter03/Listing03.03.EnablingNullableProjectWide.cs
+++ b/src/Chapter03/Listing03.03.EnablingNullableProjectWide.xml
@@ -1,4 +1,4 @@
-#region INCLUDE
+<!--#region INCLUDE-->
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
@@ -6,4 +6,4 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 </Project>
-#endregion INCLUDE
+<!--#endregion INCLUDE-->
diff --git a/src/Chapter11/Chapter11.csproj b/src/Chapter11/Chapter11.csproj
index 0a12ecf6f..91ba639b9 100644
--- a/src/Chapter11/Chapter11.csproj
+++ b/src/Chapter11/Chapter11.csproj
@@ -4,7 +4,6 @@
   </PropertyGroup>
   <Import Project="..\Chapter.props" />
   <ItemGroup>
-    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <ProjectReference Include="..\Chapter07\Chapter07.csproj" />
     <Compile Include="..\Shared\Program.cs">
       <Link>Program.cs</Link>
diff --git a/src/Chapter14/Chapter14.csproj b/src/Chapter14/Chapter14.csproj
index 8ba95cfd5..3a764c73b 100644
--- a/src/Chapter14/Chapter14.csproj
+++ b/src/Chapter14/Chapter14.csproj
@@ -4,7 +4,6 @@
   </PropertyGroup>
   <Import Project="..\Chapter.props" />
   <ItemGroup>
-    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <Compile Include="..\Shared\Program.cs">
       <Link>Program.cs</Link>
     </Compile>
diff --git a/src/Chapter15/Chapter15.csproj b/src/Chapter15/Chapter15.csproj
index a9e22a108..5a3ef4b78 100644
--- a/src/Chapter15/Chapter15.csproj
+++ b/src/Chapter15/Chapter15.csproj
@@ -4,7 +4,6 @@
   </PropertyGroup>
   <Import Project="..\Chapter.props" />
   <ItemGroup>
-    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <Compile Include="..\Shared\Program.cs">
       <Link>Program.cs</Link>
     </Compile>
diff --git a/src/Chapter16/Chapter16.csproj b/src/Chapter16/Chapter16.csproj
index 08ad02d54..bec07671b 100644
--- a/src/Chapter16/Chapter16.csproj
+++ b/src/Chapter16/Chapter16.csproj
@@ -4,7 +4,6 @@
   </PropertyGroup>
   <Import Project="..\Chapter.props" />
   <ItemGroup>
-    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <Compile Include="..\Shared\Program.cs">
       <Link>Program.cs</Link>
     </Compile>