C# 9 class or record code example

Example 1: c# record

public record Teacher : Person
{
    public string Subject { get; }

    public Teacher(string first, string last, string sub)
        : base(first, last) => Subject = sub;
}

Example 2: c# record

public record Person
{
    public string LastName { get; }
    public string FirstName { get; }

    public Person(string first, string last) => (FirstName, LastName) = (first, last);
}