//Undo function and Try not to make stack be empty
public void UndoFunc()
{
try
{
redoStack.Push(undoStack.Pop().Clone());
this.stateBoard = undoStack.Peek().Clone();
}
catch (Exception) { }
}
/// <summary>
/// Constructor
/// With given params, it initialise (creates new blank) indexBoard and stateBoard
/// </summary>
/// <param name="height"></param>
/// <param name="width"></param>
/// <param name="mineNum"></param>
public Board(int height, int width, int mineNum)
{
indexBoard = new IndexBoard(height, width, mineNum);
stateBoard = new StateBoard(height, width);
//Record
this.height = height;
this.width = width;
this.mineNum = mineNum;
}