public string Display()
{
    CartClass CartList = CartClass.GetCart();
    System.Text.StringBuilder sb = new StringBuilder();
    for (int i = 0; i < CartList.CartList.Count(); i++)
    {
        Movies Movie = CartList.CartList[i];
        sb.Append(String.Format(i + 1 + "." + "t"
+ Movie.MovieName + "t" + "£" + Movie.MovieCost.ToString() + "n" ));
    }
    return sb.ToString();
}

private void DisplayCart()
{
    lstCart.Items.Clear();
    lstCart.Items.Add(cart.Display());
}

public IEnumerable<string> Display()
    {
        CartClass CartList = CartClass.GetCart();

        for (int i = 0; i < CartList.CartList.Count(); i++)
        {
            Movies Movie = CartList.CartList[i];
            yield return String.Format(i + 1 + "." + "t"
                + Movie.MovieName + "t" + "£" + Movie.MovieCost.ToString() + "n" );
        }
    }

private void DisplayCart()
    {
        lstCart.Items.Clear();

        foreach (var movie in cart.Display())
        {
            lstCart.Items.Add(movie);
        }
    }

for (int i = 0; i < CartList.CartList.Count(); i++)
{
    Movies Movie = CartList.CartList[i];
    sb.AppendFormat("{0}.t{1}t{2:C}n", i+1, Movie.MovieName, Movie.MovieCost);
}

private void DisplayCart()
{
    lstCart.Items.Clear();
    CartClass CartList = CartClass.GetCart();
    for (int i = 0; i < CartList.CartList.Count(); i++)
    {
        Movies Movie = CartList.CartList[i];
        lstCart.Items.Add(string.Format("{0}.t{1}t{2:C}",
                           i+1, Movie.MovieName, Movie.MovieCost);
    }
}

CartClass          cart   = CartClass.GetCart() ;
IEnumerable<Movie> movies = cart.CartList ;
lstCart.DataSource        = movies;
lstCart.DataTextField     = <property-to-be-displayed-to-user>
lstCart.DataValueField    = <property-to-be-used-when-item-is-selected>
lstCart.DataBind();

public string Display()
{
  CartClass cart = CartClass.GetCart();
  StringBuilder sb = new StringBuilder();
  for ( int i = 0 ; i < cart.CartList.Count() ; i++ )
  {
    Movie movie = cart.CartList[i];
    sb.AppendFormat("{0}.t{1}t{2:C}" , i+1 , movie.MovieName , movie.MovieCost ).AppendLine() ;
  }
  return sb.ToString();
}