c＃picturebox控制不工作

Question

我正在学习如何在c＃中制作递归迷宫的教程。 这是教程：http://www.c-sharpcorner.com/uploadfile/4a950c/solving-mazes-using-recursion/

我正在按照这些步骤进行操作，但我无法继续使用，因为当我运行此代码时，图片框不会像在教程中那样显示出来。

这是他们应该做的部分：

private void createNewMaze()
    {
        mazeTiles = new PictureBox[XTILES, YTILES];
        //Loop for getting all tiles
        for (int i = 0; i < XTILES; i++)
        {
            for (int j = 0; j < YTILES; j++)
            {
                //initialize a new PictureBox array at cordinate XTILES, YTILES
                mazeTiles[i, j] = new PictureBox();
                //calculate size and location
                int xPosition = (i * TILESIZE) ; //13 is padding from left
                int yPosition = (j * TILESIZE) ; //45 is padding from top
                mazeTiles[i, j].SetBounds(xPosition, yPosition, TILESIZE, TILESIZE);
                //make top left and right bottom corner light blue. Used for start and finish
                if ((i == 0 && j == 0) || (i == XTILES - 1 && j == YTILES - 1))
                    mazeTiles[i, j].BackColor = Color.LightBlue;
                else
                {
                    //make all other tiles white
                    mazeTiles[i, j].BackColor = Color.White;
                    //make it clickable
                    EventHandler clickEvent = new EventHandler(PictureBox_Click);
                    mazeTiles[i, j].Click += clickEvent; // += used in case other events are used

                }
                //Add to controls to form (display picture box)
               this.Controls.Add(mazeTiles[i, j]);

            } 
        }
    }

这是我得到的： Maze

我无法找到解决方案，也许有人可以，提前谢谢。