https://codingblast.com/connect4-live-game-signalr-blazor/ ‎- SignalR Connect4 Blazor

GameBoard.cs

public class GameBoard 
{
	public GamePiece[, ] Board { get;	set; }

	public GameBoard() 
  {
		Board = new GamePiece[7, 6];

		// Populate the Board with blank pieces
		for (int i = 0; i <= 6; i++) {
			for (int j = 0; j <= 5; j++) {
				Board[i, j] = new GamePiece(PieceColor.Blank);
			}
		}
	}
}