static void Main(string[] args)
{
Player player1 = new Player();
player1.PlayerName = "Mina ";
player1.PlayerLastName = "Dilek";
player1.NationalityId = 123456910;
player1.DateOfBirth = 1997;
PlayerManager playerManager = new PlayerManager();
playerManager.SignUp(player1);
Game game1 = new Game();
game1.GameId = 1;
game1.GameName = "GTA V";
game1.GamePrice = 169;
Campaign campaign1 = new Campaign();
campaign1.CampaignId = 1;
campaign1.CampaignName = "Black Friday";
campaign1.DiscountRate = 45;
GameSellManager gameSellManager = new GameSellManager();
gameSellManager.SellWithNormal(player1, game1);
}