My snake moves now! Unfortunately, he goes off of the screen and into infinity. How would I fix that?

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C#

game

This collision detection code is in my FRM_Snake form. The person who created the tutorial used an integer to serve as a "wall". I'd like to share this with classmates, so my question comes in two parts:

A) How would I make the integers (height=480, width=480) act as a "wall" that will kill the snake when hit?

B) I would like the snake to go through one side of the screen and come out the opposite way. How would I code that?

Thanks so much for your help :) It is much appreciated!

public void Collisoin()
{
    for (int i = 1; i < snake.MySnake.Length; i++)
    {
        if (snake.MySnake[0].IntersectsWith(snake.MySnake[i]))
        {
            MessageBox.Show("Ouch! Quit biting yourself!\n Your total score is " + Score);
            Restart();
        }
    }

    //Use if you want game to be over when snake hits the edge of the screen
    if (snake.MySnake[0].X < 0 || snake.MySnake[0].X > 480)
    {
        MessageBox.Show("Haha! You're not a worm;\nyou can't chew through walls! Your total score is " + Score);
        Restart();
    }
    if (snake.MySnake[0].Y < 0 || snake.MySnake[0].Y > 480)
    {
        MessageBox.Show("Haha! You're not a worm;\nyou can't chew through walls! Your total score is " + Score);
        Restart();
    }
}