Design and implement a C# program (must use methods & arrays!!) that allows the user to play a version of Concentration that matches synonyms. Concentration is a card game in which all of the cards are laid face down on a surface and two cards are flipped face up over each turn. The object of the game is to turn over pairs of matching cards. The program should begin by filling an array of strings with 10 pairs of synonyms and shuffling them. The program should display the 4 row by 5 column board with ? # ? for each card face down (where # is the number of the card 1 - 20). The user should be allowed to enter the number of the card that the user wants to turn over and the program should display the word in that location on the board. The user should then be allowed to enter a second card and the word in that location should also be displayed. The pair should be removed from the board when the pair matches and turned face down when they do not. The user continues to play until all 20 cards are removed from the board.

Please help!