We can perform an initial cut on the deck of cards before applying GUID or the shuffling algorithm. The cut is done by swapping the first 26 cards with the last 26 cards.

The card class
public class Card {
//This card represents a single deck Card
//It will be used to construct a complete deck of cards (52 cards in total)
private string face; // face of card 13 ranks (A, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K)
private string suit; // suit of card (“Hearts”, “Diamonds”, “Clubs, “Spades”)

// constructor
public Card(string cardFace, string cardSuit) {
face = cardFace;
suit = cardSuit;
}
// return string representation of Card
public override string ToString() {
return face + ” of ” + suit;
}
} // end class Card

And this is the shuffling implementation
// shuffle deck of Cards
//This is a one pass algorithm for shuffling N elements O(n)
public void Shuffle() {
currentCard = 0;

for (int first = 0; first < deck.Length; first++) {
// select a random number between 0 and 51
int second = randomNumbers.Next(NUMBER_OF_CARDS);

// swap current Card with randomly selected Card
Card temp = deck[first];
deck[first] = deck[second];
deck[second] = temp;
}
}

Several variable definitions are missing but are very easy to declare them.