static List<Bullet> bullets = new List<Bullet>();
static Texture2D playerBulletTexture;

SpriteBatch spriteBatch;

public ProjectileManager(Game game, SpriteBatch spriteBatch)
    : base(game)
{
    game.Components.Add(this);
    playerBulletTexture = game.Content.Load<Texture2D>("Bullet");

    this.spriteBatch = spriteBatch;
}