Form1.cs

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

namespace shudu
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            int ktabindex = 0;
            for (int i = 1; i < 10; i++)
            {
                for (int j = 1; j < 10; j++)
                {
                    TextBox tb = new TextBox();
                    tb.MaxLength = 1;
                    tb.Width = 20;
                    tb.Height = 20;
                    tb.Left = 20 * (i - 1)+i*4;
                    tb.Top = 20 * (j - 1)+j*4;
                    tb.Name = "tb" + i.ToString() + j.ToString();
                    tb.TabIndex = ktabindex;
                    tb.KeyDown += new KeyEventHandler(KeyDown1);
                    tb.KeyUp += new KeyEventHandler(KeyUp1);
                    panel1.Controls.Add(tb);
                }
            }
        }
        private void KeyUp1(object sender, KeyEventArgs e)
        {
            if(!"123456789".Contains(((TextBox)sender).Text))
                ((TextBox)sender).Text = "" ;
            if (((TextBox)sender).Text.Length == 1)
                SendKeys.Send("\t");
        }
        private void KeyDown1(object sender, KeyEventArgs e)
        {
            if (e.KeyValue < 97 || e.KeyValue > 107)
            {
                ((TextBox)sender).Text = ""; 
                return;
            }
            
            label1.Text += e.KeyValue.ToString();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            bool test = true;
            for (int i = 1; i < 10; i++)