Sopadeletras

EMPIEZA EL FORM1.CS
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
usingSystem.Windows.Forms;
namespace SopadeLetras
{
    public partial class Form1 : Form
    {
        Sopa ob1 = new Sopa();
        public Form1()
        {
            InitializeComponent();            dataGridView1.RowCount = dataGridView1.ColumnCount = 10;
            ob1.LLENAR(dataGridView1);
            ob1.LLENAR_VACIOS(dataGridView1);
            textBox1.Focus();
          
        }
       private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
       private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == Convert.ToChar(Keys.Enter))
            {
                string palabra = textBox1.Text;                palabra=palabra.ToUpper();
                if (ob1.Buscar(palabra) == false)
                {
                    MessageBox.Show("Esa palabra no se encuentra");                    textBox1.Clear();
                    textBox1.Focus();
                }
                else
                    switch (palabra)
                    {
                        case "MICROSOFT":                            {
                                label2.Text = palabra;
                                textBox1.Clear();
                                textBox1.Focus();
                           }
                            break;
                        case "MACINTOSH":
                            {
                                label3.Text = palabra;
                               textBox1.Clear();
                                textBox1.Focus();
                            }
                            break;
                       ...