server/CSserver/PBReferens/PBReferens.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

  <Target Name="PreBuild" BeforeTargets="PreBuildEvent">
    <Exec Command="protoc --csharp_out=pbcs pb/*.proto" />
  </Target>

  <ItemGroup>
    <PackageReference Include="Google.Protobuf" Version="3.17.3" />
    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
  </ItemGroup>

</Project>