DrawCard blackjack from CSharpforBeginners

I'm just starting c# and I'm following Bob Tabor's C# Fundamentals for Absolute Beginners and part of the course information it gives a companion guide. On the Module 6 lab I'm stuck on trying to figure out how to draw a card in a game of black jack. I'm trying to stick to the course material so I would like to try to figure this out using arrays vs list which I know would be easier.

So my problem is that I'm not sure at the end why my return drawCard[0] throws an exception

Index was outside the bounds of the array

when I am specifically calling position 0 and how would I go about fixing this?

public Card DrawCard()
    {
        // Will generate a random number between 0 and 51.
        Random getRandomNumber = new Random();
        int randomNumber = getRandomNumber.Next(0, 52);
        // Created array drawnCard so I could set array Cards = to it.
        Card[] drawnCard = new Card[0];            

        // Checks to see if the deck is empty.
        if (cardsDrawn == 52)
        {
            drawnCard[0] = null;
            Console.WriteLine("No cards left to draw.");
        }
        // Sets the drawnCard to a random card pulled from the deck.
        else if (Cards[randomNumber] != null)
        {
            Array.Copy(Cards, randomNumber, drawnCard, 0, 0);
            //drawnCard[0] = Cards[randomNumber];
            Cards[randomNumber] = null;
            cardsDrawn++;
        }
        else
        {
            // Keeps looping until cards has been drawn.
            while (Cards[randomNumber] == null)
            {
                randomNumber = RandomGenerator.Next(0, 52);
                if (Cards[randomNumber] != null)
                {
                    Array.Copy(Cards, randomNumber, drawnCard, 0, 0);
                    //drawnCard[0] = Cards[randomNumber];
                    Cards[randomNumber] = null;
                    cardsDrawn++;
                }
            }
        }
        return drawnCard[0];
    }