This is in the ball.cs, ball extends sprite.cs

Here it is passed the paddle object:

        public ball(Texture2D texture, Vector2 position, Color colour, sprite Paddle)
            :base(texture, position, colour)
        {
            _position.X = 200;
            _position.Y = 100;
            _colour = Color.Red;
            thisPaddle = (paddle)Paddle;
        }

This checks for a collision. Rect being the accessor to the paddles bounding Box. _rect being the inherited class member for the balls bounding box.

        public bool paddleCollision()
        {
            if (thisPaddle.Rect.Intersects(_rect)){
                return true;
            }else{
                return false;
            }
        }

This is just the update code, to occur each "tick"
        public override void update(KeyboardState state)
        {
            if (paddleCollision())
            {
                _moveSpeed.Y = -_moveSpeed.Y;
                _moveSpeed.X = _moveSpeed.X += thisPaddle.speedReturn() * 0.1f;
            }
            _position += _moveSpeed;
        }
    }