private void lstBoxAccessories_SelectedIndexChanged(object sender, EventArgs e)
 {
     if (lstBoxAccessories.SelectedIndex != -1)
     {
         int i = lstBoxAccessories.SelectedIndex;
         extras = extrasList[i];
     }
 }
        private void revealTheDataAccessories()
        {
            string    queryString = "SELECT * FROM Tilbehør;";
            DataTable dt          = GetData(queryString);

            foreach (DataRow item in dt.Rows)
            {
                var theExtras = new Tilbehør();
                theExtras.Id             = Convert.ToInt32(item["Id"].ToString());
                theExtras.EkstraTilbehør = item["Ekstra Tilbehør"].ToString();
                theExtras.Price          = Convert.ToDecimal(item["Price"].ToString());
                extrasList.Add(theExtras);
            }
            lstBoxAccessories.ValueMember   = "Id";
            lstBoxAccessories.DisplayMember = "EkstraTilbehør";
            lstBoxAccessories.DataSource    = extrasList;
        }