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