Why does copy of the List still change properties in the original List using C#

Question

Lets say I have this class

public class Employee
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public bool isActive {          


        

Answer 1

Because the new list still contains references to the same employee objects. You can create new ones in a new list by doing something like this:

    List Employees = new List();
    Employees.Add(new Employee { FirstName = "firstname", LastName = "lastname", isActive = true });
    List EmployeesCopy = Employees.Select(x => new Employee(x)).ToList();

    public class Employee
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public bool isActive { get; set; }

        public Employee()
        { }

        public Employee(Employee e)
        {
            FirstName = e.FirstName;
            LastName = e.LastName;
            isActive = e.isActive;
        }
    }