2021.2/CSharp20212/NullableReferenceTypes/ChangeNullability.cs [13:55]:
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    public class Employees
    {
        private readonly List<Person> _supportEngineers;
        private readonly List<Person> _softwareEngineers;

        public Employees(List<Person> supportEngineers, List<Person> softwareEngineers)
        {
            _supportEngineers = supportEngineers;
            _softwareEngineers = softwareEngineers;
        }

        public IEnumerable<Person> AllEmployees
        {
            get
            {
                var employees = new List<Person>();
                employees.AddRange(_supportEngineers);
                employees.AddRange(_softwareEngineers);

                return employees;
            }
        }

        // 1. Add ? to Person (or caret on person, Refactor This -> Make nullable)
        // 2. See refactoring show up in gutter, use it ("Apply nullability change")
        // 3. Review type changes, see class will be updated
        // 4. Apply, see List<Person?> etc. everywhere
        public void AddEmployee(Person person, Role role)
        {
            var targetList = role switch
            {
                Role.SupportEngineer => _supportEngineers,
                Role.SoftwareEngineer => _softwareEngineers,
            };

            targetList.Add(person);
        }
    }

    public enum Role
    {
        SupportEngineer,
        SoftwareEngineer
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2021.3/CS10/Namespaces/BlockScoped/BlockScopedNamespace.cs [12:50]:
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public class Employees
{
    private readonly List<Person> _supportEngineers;
    private readonly List<Person> _softwareEngineers;

    public Employees(List<Person> supportEngineers, List<Person> softwareEngineers)
    {
        _supportEngineers = supportEngineers;
        _softwareEngineers = softwareEngineers;
    }

    public IEnumerable<Person> AllEmployees
    {
        get
        {
            var employees = new List<Person>();
            employees.AddRange(_supportEngineers);
            employees.AddRange(_softwareEngineers);

            return employees;
        }
    }
        
    public void AddEmployee(Person person, Role role)
    {
        var targetList = role switch
        {
            Role.SupportEngineer => _supportEngineers,
            Role.SoftwareEngineer => _softwareEngineers,
        };

        targetList.Add(person);
    }
}

public enum Role
{
    SupportEngineer,
    SoftwareEngineer
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