Oyyou.MonoGameTutorials/MonoGame_Tutorials/Tutorial006/Sprites/Bullet.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace Tutorial006.Sprites
{
  public class Bullet : Sprite
  {
    private float _timer;

    public Bullet(Texture2D texture) 
      : base(texture)
    {

    }

    public override void Update(GameTime gameTime, List<Sprite> sprites)
    {
      _timer += (float)gameTime.ElapsedGameTime.TotalSeconds;

      if (_timer >= LifeSpan)
        IsRemoved = true;

      Position += Direction * LinearVelocity;
    }
  }
}