private int countImages()
        {
            sqlConnection = new SqlConnection(connectionString);

            using (sqlConnection)
            {
                sqlConnection.Open();

                String sqlcomm = "SELECT Count(*) FROM [Pictures$]";

                SqlCommand command = new SqlCommand(sqlcomm, sqlConnection);

                int result = (int)command.ExecuteScalar();

                return result;
            }
        }

        private void loadPage()
        {
            sqlConnection = new SqlConnection(connectionString);

            using (sqlConnection)
            {
                sqlConnection.Open();

                String sqlcomm = "SELECT [Img] , [CreateTime] FROM [Pictures] P" +
                    " Order By P.CreateTime Desc" +
                    " Offset @click Rows FETCH NEXT @svm ROWS ONLY";
                SqlCommand cmd = new SqlCommand(sqlcomm, sqlConnection);
                cmd.Parameters.AddWithValue("@click", click);
                cmd.Parameters.AddWithValue("@svm", svm);

                dataAdapter.SelectCommand = cmd;
                DataSet data = new DataSet();
                dataAdapter.Fill(data);

                imageList1.Images.Clear();
                listView1.Clear();

                for (int i = 0; i < data.Tables[0].Rows.Count; i++)
                {
                    imageList1.Images.Add(Image.FromFile("..\\Pictures\\" + data.Tables[0].Rows[i].ItemArray[0].ToString()));
                }

                listView1.LargeImageList = imageList1;

                for (int i = 0; i < imageList1.Images.Count; i++)
                    listView1.Items.Add("").ImageIndex = i;

            }
        }

        private void left_Click(object sender, EventArgs e)
        {
            if (click > 0)
            {
                if (!right.Enabled)
                {
                    right.Enabled = true;
                }

                click -= svm;

                loadPage();
            }
            else
            {
                left.Enabled = false;
            }

        }

        private void right_Click(object sender, EventArgs e)
        {
            if (click + svm < totalPhotos)
            {
                if (!left.Enabled)
                {
                    left.Enabled = true;
                }
                click += svm;

                loadPage();
            }
            else
            {
                right.Enabled = false;
            }
        }

        private int checkData(string jobnumber, string password)
        {
            //Защита от SQL-Injection при помощи параметризованных команд
            String sqlchecked = "if (Isnull((Select RoleId From Admin$ Where Jobnumber like(@Jobnumber) and Passwords like(@Password)) , 0) = 0)" +
                " Select 0 " +
                " else " +
                " Select RoleId From Admin$  Where Jobnumber like(@Jobnumber) and Passwords like(@Password)";

            sqlConnection = new SqlConnection(connectionString);
            int result = 0;
            using (sqlConnection)
            {
                sqlConnection.Open();

                SqlCommand command = new SqlCommand(sqlchecked, sqlConnection);
                //Автоматическое определение типа вводимых данных
                command.Parameters.AddWithValue("@Jobnumber", jobnumber);
                command.Parameters.AddWithValue("@Password", password);
                //Получение данных из первого столбца первой строки таблицы
                result = (int)command.ExecuteScalar();
            }
            return result;
        }

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(toolbar)

        //список id изображений
        var images = ArrayList<Int>()

        images.add(R.drawable.a1)
        //...
        images.add(R.drawable.a12)

        listView.adapter = CustomAdapter(images.toTypedArray())

        listView.onItemClickListener = AdapterView.OnItemClickListener { _: AdapterView<*>, _: View, i: Int, _: Long ->
            var intent = Intent(this, FullscreenActivity::class.java)
            //передаем id изображения, которое нужно посмотреть
            intent.putExtra("id",images[i])
            startActivity(intent)
        }
    }
}

class CustomAdapter internal constructor(var images: Array<Int>) :
    BaseAdapter() {

    override fun getCount(): Int {
        return images.size
    }

    // элемент по позиции
    override fun getItem(position: Int): Int {
        return images[position]
    }

    // id по позиции
    override fun getItemId(position: Int): Long {
        return position.toLong()
    }

    // пункт списка
    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
        //используем уже созданное представление
        var view: View? = convertView
        //если нет, создаем новое
        if (view == null) {
            val inflater = LayoutInflater.from(parent.context)
            view = inflater.inflate(R.layout.item, parent, false)
        }

        view!!.findViewById<ImageView>(R.id.imageView).setImageResource(images[position])

        return view
    }

}

class FullscreenActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_fullscreen)

        //Получаем id изображения
        var id = intent.getIntExtra("id",-1)

        imageView2.setImageResource(id)
    }
}

        private void exportExcel_Click(object sender, EventArgs e)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Filter = "Excel (*.xls)|*.xls|All files (*.*)|*.*";
            saveFileDialog.DefaultExt = ".xls";

            if (saveFileDialog.ShowDialog() != DialogResult.OK)
                return;

            if (saveFileDialog.FileName.Equals(""))
                return;

            DataTable dt = (DataTable)dataGridView2.DataSource;
            //Открываем файл
            StreamWriter wr = new StreamWriter(saveFileDialog.FileName);

            try
            {
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    wr.Write(dt.Columns[i].ToString().ToUpper() + "\t");
                }

                wr.WriteLine();

                //Записываем строки в файл Excel
                for (int i = 0; i < (dt.Rows.Count); i++)
                {
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        if (dt.Rows[i][j] != null)
                        {
                            wr.Write(Convert.ToString(dt.Rows[i][j]) + "\t");
                        }
                        else
                        {
                            wr.Write("\t");
                        }
                    }
                    //Переходим на следующую строку
                    wr.WriteLine();
                }
                //Закрываем файл
                wr.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(this, ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }