Slagalica-kviz

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;

using System.Data.SqlClient;

namespace Test_slagalica
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        int i;
        string[] slova = new string[12];
        Random random = new Random();
        private void Form1_Load(object sender, EventArgs e)
        {
            string cs = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename= C:\Users\Pavle\Documents\Visual Studio       2015\Projects\Test slagalica\Test slagalica\Slagalica-DB.mdf;Integrated Security=True";
        string queryString = "SELECT * FROM table1 WHERE LEN(Reci) >=10 AND LEN(Reci) <=12 ORDER BY NEWID()";

using (SqlConnection connection = new SqlConnection(cs))
            {
                SqlCommand mycommand = new SqlCommand(queryString, connection);
                try
                {
                    connection.Open();
                    string word = (string)mycommand.ExecuteScalar();
                    string promesana_rec = new string(word.OrderBy(r => random.Next()).ToArray());
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }

            Label[] label = new Label[] { label2, label3, label4, label5, label6, label7, label8, label9, label10, label11, label12, label13 };
            for (int i = 0; i < 12; i++)
                slova[i] = label[i].Text;

            button1.Text = "Start";
            textBox1.Text = "";
            textBox2.Text = "";
            textBox1.Enabled = false;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Label[] label = new Label[] { label2, label3, label4, label5, label6, label7, label8, label9, label10, label11, label12, label13 };
            for (int i = 0; i < 12; i++)
                slova[i] = label[i].Text;

           timer1.Start();

            int counter = 0;
                if (!button1.Enabled)
                    return;
                if (button1.Text == "Start")
                {
                    i = 0;
                    timer1.Enabled = true;
                    button1.Text = "Stop";
                    button1.Enabled = true;
                }
                else
                {
                //label[i].Text = slova[i];
                //label[i].Text = Convert.ToString(word[i]);
                label1.Text = Convert.ToString(word[counter]);
                //i = i + 1;
                counter++;
                    if (i == 12)
                    {
                        textBox1.Enabled = true;
                        button1.Enabled = false;
                        button1.Text = "Start";
                        timer1.Enabled = false;
                        textBox1.Focus();
                    }
                }
            }
        private void timer1_Tick(object sender, EventArgs e)
        {
            //char[] letters = "AБВГДЂЕЖЗИЈКЛЉМНЊОПРСТЋУФХЦЧЏШ".ToCharArray();
            char[] letters = new char[30] { 'A', 'Б', 'В', 'Г', 'Д', 'Ђ', 'Е', 'Ж', 'З', 'И', 'Ј', 'К', 'Л', 'Љ', 'М', 'Н', 'Њ', 'О', 'П', 'Р', 'С', 'Т', 'Ћ', 'У', 'Ф', 'Х', 'Ц', 'Ч', 'Џ', 'Ш' };
            Label[] label = new Label[] { label2, label3, label4, label5, label6, label7, label8, label9, label10, label11, label12, label13 };
            string randomString = "";
            randomString += letters[random.Next(0, 30)].ToString();
            label[i].Text = randomString;
        }
    }
}