❔ ✅ WinForms ListBox.DataSource not working

public partial class Form1 : Form
{
    private List<Employee> _employees;
    public Form1()
    {
        _employees = new();
        InitializeComponent();
        EmployeesListBox.DataSource = _employees;
    }

    private void CreateEmployeeButton_Click(object sender, EventArgs e)
    {
        var employee = new Employee();
        var prompt = new EmployeeCreatorForm(employee);
        prompt.Closing += (_, _) => // No leaking since prompt is closing
        {
            if (!prompt.Completed)
                return;

            _employees.Add(employee);
            Show();
            EmployeesListBox.Refresh();
        };

        Hide();
        prompt.Show();
    }

    private void CreateManagerButton_Click(object sender, EventArgs e)
    {
        var manager = new Manager();
        var prompt = new ManagerCreatorForm(manager);
        prompt.Closing += (_, _) =>
        {
            if (!prompt.Completed)
                return;

            _employees.Add(manager);
            Show();
            EmployeesListBox.Refresh();
        };

        Hide();
        prompt.Show();
    }
}