using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
 
 public PictureBox[,] hairetu = new PictureBox[10, 20];
        public Form1()
        {
            Timer timer = new Timer();
            timer.Tick += new EventHandler(MyClock);
            timer.Interval = 1000;
            timer.Enabled = true; // timer.Start()と同じ

            InitializeComponent();
        }
 
 public void MyClock(object sender, EventArgs e)
        {
            bool chinko = true;
            for (int a = 0; a < 10; a++)
            {
                for (int b = 0; b < 20; b++)
                {
                    if (hairetu[a, b] != null && hairetu[a, b].unko == true)
                    {
                        chinko = false;
                    }
                }
            }

if (chinko)
            {
                Random rnd = new Random();
                int ransuu = rnd.Next(0, 9);
                hairetu[ransuu, 0] = new PictureBox();
                hairetu[ransuu, 0].Location = new Point(ransuu * 20, 20);
                hairetu[ransuu, 0].BackColor = Color.Red;
                hairetu[ransuu, 0].Size = new Size(20, 20);
                this.Controls.Add(hairetu[ransuu, 0]);
            }
        }
    }
}