Version

https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-version-history

• https://netpyoung.github.io/csharp-features/docs/

• https://stackoverflow.com/questions/247621/what-are-the-correct-version-numbers-for-c

• https://www.c-sharpcorner.com/article/c-sharp-versions/

9.0

top level statement

• https://learn.microsoft.com/en-us/dotnet/core/tutorials/top-level-templates
  • --use-program-main
  • <PropertyGroup> <ImplicitUsings>disable</ImplicitUsings> </PropertyGroup>
  • <ItemGroup> <Using Remove="System.Net.Http" /> </ItemGroup>