c# 9.0 the complete reference code example

Example 1: record c#

public record Person(string FirstName, string LastName);

public record Teacher(string FirstName, string LastName,
    string Subject)
    : Person(FirstName, LastName);

public sealed record Student(string FirstName,
    string LastName, int Level)
    : Person(FirstName, LastName);

Example 2: c# record

public sealed record Student : Person
{
    public int Level { get; }

    public Student(string first, string last, int level) : base(first, last) => Level = level;
}