/// <summary>
        /// if you choose the type of currency again
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void back(object sender, EventArgs e)
        {
            Form form = new Preload();

            form.Show();
            this.Dispose();
        }
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Form form = new Preload();

            form.Show();
            Application.Run();
        }