Adding a constraint to a List<>

public class Team : List<employee>
{
    public int MaxEmployees { get; private set; }

    public virtual String Name { get; private set; }

    [Display(Name = "Project Title")]
    public String ProjectTitle { get; private set; }

    public DateTime DateCreated { get; private set; }

    public Team(string name, string title, int maxEmployees)
    {
        Name = name;
        ProjectTitle = title;
        DateCreated = DateTime.Now;
        MaxEmployees = maxEmployees;    
    }

    // note use of 'new, not 'override ...
    public new void Add(Employee employee)
    {
        if (this.Count == MaxEmployees)
        {
            throw new ArgumentOutOfRangeException("", "Maximum Number of Employees on Team reached");
        }

        base.Add(employee);
    }
}</employee>