BuildAllSamples.proj

<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
  
  <ItemGroup>
    <SampleSolutions Include="..\**\*.sln"/>
  </ItemGroup>
  
  <Target Name="Build">

    <Exec Command="nuget restore %(SampleSolutions.Identity)" />
    <MsBuild Projects="%(SampleSolutions.Identity)" Targets="Build" Properties="Configuration=Release;Platform=Any CPU" BuildInParallel="True" />

  </Target>
  
</Project>