Update Proj files
MODIFY
src/Chapter01/Chapter01.csproj
src/Chapter01/Chapter01.csproj
<ExpectedWarnings>$(ExpectedWarnings),CA1052,IDE0059,IDE0060</ExpectedWarnings>
</PropertyGroup>
<Import Project="..\Chapter.props" />
+ <ItemGroup>
+ <Compile Remove="Listing01.02.PLACEHOLDER.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="Listing01.02.SampleNETCoreConsoleProjectFile.csproj" />
+ <None Include="Listing01.02.Placeholder.cs" />
+ </ItemGroup>
</Project>

MODIFY
src/Chapter01/Listing01.02.Placeholder.cs
src/Chapter01/Listing01.02.Placeholder.cs
-<Project Sdk="Microsoft.NET.Sdk">
- <PropertyGroup>
- <OutputType>Exe</OutputType>
- <TargetFramework>netcoreapp3.1</TargetFramework>
- </PropertyGroup>
-</Project>
\ No newline at end of file

Update Proj files