Attributes - in COBOL and C#

using System;

// Attribute on a class
[Author("Benjamin Franklin")]
public class Attributes
{
    // Attribute on a field
    [Author(AuthorName = "Benjamin Franklin")]
    string book;

    // Attribute on a property
    [Author("Benjamin Franklin")]
    string TheBook
    {
        get => book;
        
        // Attribute on a property accessor
        [Author("Benjamin Franklin")]
        set => book = value;
    }


    // Attribute on a method and argument
    [Author("Benjamin Franklin")]
    string GetAnotherBook([Author("Benjamin Franklin")] string arg1)
    {
        return book;
    }
}

    // Attribute declaration
    public class AuthorAttribute : Attribute
    {
        public string AuthorName { get; set; }

        public AuthorAttribute() { }

        public AuthorAttribute(string authorName)
        {
            AuthorName = authorName;
        }
}

*> Attribute on a class
class-id Attributes
    attribute Author(name AuthorName = "Benjamin Franklin").


*> Attribute on a field
01 book string attribute Author(name AuthorName = "Benjamin Franklin").

*> Attribute on a property
01 bookProperty string property
    attribute Author(name AuthorName = "Benjamin Franklin").


*> Attribute on a method and argument
method-id GetAnotherBook
    attribute Author(name AuthorName = "Benjamin Franklin")
    (arg1 as string
        attribute Author(name AuthorName = "Benjamin Franklin"))
    returning return-value as string.
        set return-value to book
end method.

end class.

*> Attribute definition
 attribute-id AuthorAttribute public.
 01 AuthorName string property.

end attribute.

Imports System

' Attribute on a class
<Author("Benjamin Franklin")>
public class Attributes

    ' Attribute on a field
    <Author(AuthorName := "Benjamin Franklin")>
    Private book As String

    ' Attribute on a property
    <Author("Benjamin Franklin")>
    Property TheBook As String
        Get
            return book
        End Get

        ' Attribute on a property accessor
        <Author("Benjamin Franklin")>
        Set(value as String)
            book = value
        End Set
    End Property

    ' Attribute on a method and argument
    <Author("Benjamin Franklin")>
    Function GetAnotherBook(
        <Author("Benjamin Franklin")> arg1 As String) As String
        return book
    End Function
End Class

' Attribute declaration
Public Class AuthorAttribute
    Inherits Attribute

    Public Property AuthorName As String

    Public Sub New()
    End Sub

    Public Sub New(authorName As String)
        AuthorName = authorName
    End Sub
End Class