assets/samples/Samples/ObjectViewer/CS/ObjectViewer.csproj

<Project Sdk="">
  <PropertyGroup>
    <RootNamespace>Revit.SDK.Samples.ObjectViewer.CS</RootNamespace>
  </PropertyGroup>
  <Import Project="$(SolutionDir)VSProps\SDKSamples.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x64'">
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
  </PropertyGroup>
  <ItemGroup>
    <Compile Remove="GraphicsData.cs" />
  </ItemGroup>
  <Import Project="$(SolutionDir)VSProps\SDKSamples.targets" />
  <PropertyGroup>
    <PostBuildEvent>set FILEFORSAMPLEREG="$(SolutionDir)..\..\..\..\Regression\API\SDKSamples\UpdateSampleDllForRegression.py"
if exist %25FILEFORSAMPLEREG%25 py -3 %25FILEFORSAMPLEREG%25  "$(ProjectPath)" "$(TargetPath)" "$(SolutionDir)"</PostBuildEvent>
  </PropertyGroup>
  <PropertyGroup>
    <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
  </PropertyGroup>
</Project>