Hi @Russ Beech ,
The MSDN & TechNet libraries have been migrated to learn.microsoft.com, for more information see:
https://learn.microsoft.com/en-us/teamblog/msdn-technet-migration
For the current Visual Studio and C# documentations please see:
Visual Studio - Documentation
https://learn.microsoft.com/en-us/visualstudio/?view=vs-2019
C# - Documentation
https://learn.microsoft.com/en-us/dotnet/csharp
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Best regards,
Leon