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

GamePiece.cs

public class GamePiece
{
    public PieceColor Color;

    public GamePiece() => Color = PieceColor.Blank;

    public GamePiece(PieceColor color) => Color = color;
}