public void AddPlayer(Player player)
{
if (CheckIfPlayerExists(player))
{
throw new InvalidOperationException("The Player already exists in the team.");
}
else
{
this.players.Add(player);
}
}
private bool CheckIfPlayerExists(Player player)
{
return this.players.Any(p => p.FirstName == player.FirstName && p.LastName == player.LastName);
}