Remove examples written in Visual Basic

[jozefizso]

Removes the examples in Visual Basic as the primary language of the project is C# and it is not feasible to maintain examples in two languages.

Upgrade to .NET Framework 4.6.2

All projects target the .NET Framework 4.6.2 now as it it the lowest supported version.

.NET Framework 4.5.2, 4.6, and 4.6.1 will reach end of support* on April 26, 2022. After this date, we will no longer provide updates including security fixes or technical support for these versions.

Customers currently using .NET Framework 4.5.2, 4.6, or 4.6.1 need to update their deployed runtime to a more recent version – at least .NET Framework 4.6.2 before April 26, 2022 – in order to continue to receive updates and technical support.

https://devblogs.microsoft.com/dotnet/net-framework-4-5-2-4-6-4-6-1-will-reach-end-of-support-on-april-26-2022/
https://learn.microsoft.com/en-us/lifecycle/products/microsoft-net-framework