//Show all restaurant name and location
void showAll()
{
List <Restaurant> restaurantList;
RestaurantService restaurantService = new RestaurantService();
restaurantList = restaurantService.GetAllSearchList();
listBox1.Items.Clear();
foreach (var item in restaurantList)
{
string listItem = string.Format("{0}-{1}", item.Name, item.Location);
listBox1.Items.Add(listItem);
}
}