public class Game1 : Game
{
  [...]
  protected override void Update(GameTime gameTime)
  {
      if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
          Exit();

      HandleInput();
      MovePlayerLasers();
      CheckAndRemove();

      base.Update(gameTime);
  }
  [...]
}