DART hjälp

Hej,
kan någon hjälpa mig med min program som startar inte ?
Tyvärr vill inte min lärare hjälpa mig.
När jag startar program får jag 2 samma fel: ''Error CS0246: The type or namespace name 'List<>' could not be found (are you missing a using directive or an assembly reference?) (CS0246) (dart301)''

Snälla hjälpa mig

****************************************************

using System;

namespace dartspel

{
class Program
{
static void Main(string[] args)
{
var MyGame = new Game();
MyGame.PlayGame();
Console.WriteLine("Press any key to continue");
Console.ReadKey();
}
}
class Game
{
private List<Player> nameList = new List<Player>();

public void AddPlayer(string name)
{
Player players = new Player(name);
nameList.Add(players);
}
public void PlayGame()
{
int arrow1;
int arrow2;
int arrow3;

int total = 0;
int winner = 301;
Random slumptal = new Random();

Console.WriteLine("Välkommen till dart 301");
Console.WriteLine("Ange hur många ni är som spelar:");
int numberPlayers = int.Parse(Console.ReadLine());

for (int i = 0; i < numberPlayers; i++)
{
Console.WriteLine("Ange namnen på spelarna");
string playerName = Console.ReadLine();
AddPlayer(playerName);
}

{
foreach (var player in nameList)
{

Console.WriteLine("Det är {0}'s tur. Skriv in tre kast mellan 1-20", player);
arrow1 = int.Parse(Console.ReadLine());
if (arrow1 > 20 || arrow1 < 0)
{
Console.WriteLine("Ange endast ett tal mellan 1-20!");
--arrow1;
}
arrow2 = int.Parse(Console.ReadLine());
if (arrow2 > 20 || arrow2 < 0)
{
Console.WriteLine("Ange endast ett tal mellan 1-20!");
--arrow2;
}
arrow3 = int.Parse(Console.ReadLine());
if (arrow3 > 20 || arrow3 < 0)
{
Console.WriteLine("Ange endast ett tal mellan 1-20!");
--arrow3;
}

player.AddThrows(arrow1, arrow2, arrow3);
total = player.CalculatePoints();

}
}
while (total <= winner);

if (total >= winner)
{
Console.WriteLine("Vi har en vinanre!!\n");
}

foreach (var player in nameList)
{
player.PrintTurns();
}

}

class Player
{
private string name { get; set; }
private List<Turns> throwList = new List<Turns>();

public Player(string _name)
{
name = _name;
}
public void AddThrows(int kast1, int kast2, int kast3)
{
throwList.Add(new Turns(kast1, kast2, kast3));
}

public int CalculatePoints()
{
int score = 0;
foreach (var turns in throwList)
{
score = score + turns.GetScore();
}
return score;
}
public void PrintTurns()
{
Console.WriteLine("Statistik för spelare {0}", name);
Console.WriteLine("----------------------------------------------");
foreach (var turns in throwList)
{
Console.WriteLine(turns);
}
Console.WriteLine("----------------------------------------------");
Console.WriteLine("Totalpoängen för {1} {0}\n", CalculatePoints(), name);

}
public override string ToString()
{
return name;
}
}
class Turns
{
private int throwOne;
private int throwTwo;
private int throwThree;

public Turns(int throw1, int throw2, int throw3)
{
throwOne = throw1;
throwTwo = throw2;
throwThree = throw3;
}
public int GetScore()
{
int totalt = throwOne + throwTwo + throwThree;
return totalt;
}
public override string ToString()
{
return string.Format("Kasst ett: {0}, Kasst två: {1}, Kasst tre {2} ", throwOne, throwTwo, throwThree);
}
}

}
}