class PetOwner
{
    public string Name { get; set; }
    public List<string> Pets { get; set; }
}

public static void SelectManyEx3()
{
    PetOwner[] petOwners =
        { new PetOwner { Name="Higa", 
              Pets = new List<string>{ "Scruffy", "Sam" } },
          new PetOwner { Name="Ashkenazi", 
              Pets = new List<string>{ "Walker", "Sugar" } },
          new PetOwner { Name="Price", 
              Pets = new List<string>{ "Scratches", "Diesel" } },
          new PetOwner { Name="Hines", 
              Pets = new List<string>{ "Dusty" } } };

    // Project the pet owner's name and the pet's name.
    var query =
        petOwners
        .SelectMany(petOwner => petOwner.Pets, (petOwner, petName) => new { petOwner, petName })
        .Where(ownerAndPet => ownerAndPet.petName.StartsWith("S"))
        .Select(ownerAndPet =>
                new
                {
                    Owner = ownerAndPet.petOwner.Name,
                    Pet = ownerAndPet.petName
                }
        );

    // Print the results.
    foreach (var obj in query)
    {
        Console.WriteLine(obj);
    }
}

class PetOwner
           {
               public string Name { get; set; }
               public List<String> Pets { get; set; }
           }

           public static void SelectManyEx1()
           {
               PetOwner[] petOwners = 
                   { new PetOwner { Name="Higa, Sidney", 
                         Pets = new List<string>{ "Scruffy", "Sam" } },
                     new PetOwner { Name="Ashkenazi, Ronen", 
                         Pets = new List<string>{ "Walker", "Sugar" } },
                     new PetOwner { Name="Price, Vernette", 
                         Pets = new List<string>{ "Scratches", "Diesel" } } };

               // Query using SelectMany().
               IEnumerable<string> query1 = petOwners.SelectMany(petOwner => petOwner.Pets);

               Console.WriteLine("Using SelectMany():");

               // Only one foreach loop is required to iterate 
               // through the results since it is a
               // one-dimensional collection.
               foreach (string pet in query1)
               {
                   Console.WriteLine(pet);
               }

               // This code shows how to use Select() 
               // instead of SelectMany().
               IEnumerable<List<String>> query2 =
                   petOwners.Select(petOwner => petOwner.Pets);

               Console.WriteLine("\nUsing Select():");

               // Notice that two foreach loops are required to 
               // iterate through the results
               // because the query returns a collection of arrays.
               foreach (List<String> petList in query2)
               {
                   foreach (string pet in petList)
                   {
                       Console.WriteLine(pet);
                   }
                   Console.WriteLine();
               }
           }

class PetOwner
{
    public string Name { get; set; }
    public List<string> Pets { get; set; }
}

public static void SelectManyEx2()
{
    PetOwner[] petOwners = 
        { new PetOwner { Name="Higa, Sidney", 
              Pets = new List<string>{ "Scruffy", "Sam" } },
          new PetOwner { Name="Ashkenazi, Ronen", 
              Pets = new List<string>{ "Walker", "Sugar" } },
          new PetOwner { Name="Price, Vernette", 
              Pets = new List<string>{ "Scratches", "Diesel" } },
          new PetOwner { Name="Hines, Patrick", 
              Pets = new List<string>{ "Dusty" } } };

    // Project the items in the array by appending the index 
    // of each PetOwner to each pet's name in that petOwner's 
    // array of pets.
    IEnumerable<string> query =
        petOwners.SelectMany((petOwner, index) =>
                                 petOwner.Pets.Select(pet => index + pet));

    foreach (string pet in query)
    {
        Console.WriteLine(pet);
    }
}