using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class Test
{
	public static void Main()
	{
	var dtMovieListDetails = new List<MovieClass>()
	{
		new MovieClass() { Format="DVD", MovieName="Star Wars", Price=12.99M},
		new MovieClass() { Format="DVD", MovieName="Star Wars II", Price=13.99M},
		new MovieClass() { Format="Blue-Ray", MovieName="Star Wars", Price=15.99M},
		new MovieClass() { Format="Blue-Ray", MovieName="Star Wars II", Price=17.99M}
	};

	var moviesToBuy = from movie in dtMovieListDetails
		orderby movie.Format, movie.Price
		group movie by movie.Format into grp
		select new
		{
		    Format = grp.Key,
			Movies = grp.Select (g => new { MovieName = g.MovieName, Price = g.Price })
		};
		
	foreach(var movie in moviesToBuy)
	{
		Console.WriteLine(movie.Format);
		foreach(var detail in movie.Movies)
		{
		    Console.WriteLine(string.Format("    {0}     {1}", detail.MovieName, detail.Price));
		}
	}
	}
}

public class MovieClass
{
	public string Format { get; set; }
	public string MovieName { get; set; }
	public decimal Price { get; set; }
}