lately very much interested in XNA, i wanted to write some of the issues

 private void SimpleCollision()
        {
            Rectangle rectangle1;
            Rectangle rectangle2;

            foreach (var blt in lstBullet)
            {

                rectangle1 = new Rectangle((int)blt.position.X, (int)blt.position.Y, blt.bull.Width, blt.bull.Height);

                foreach (var enm in lstEnemy)
                {
                    rectangle2 = new Rectangle((int)enm.enemyPosition.X,
                        (int)enm.enemyPosition.Y, enm.enemy.Width, enm.enemy.Height);

                    if (rectangle1.Intersects(rectangle2))
                    {
                        enm.status = false;
                        blt.status = false;
                    }
                }
            }
        }