That are class defined within an other class = nested, see
https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/nested-types
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see the picture below, I want to know , the nested means, thanks!!
That are class defined within an other class = nested, see
https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/nested-types