C#

public class ChildItem
{
  public ChildItem()
  {
    Count = int.MaxValue;
    LongCount = long.MaxValue;
    Nullable2 = int.MaxValue - 3;
    Nullable3 = Nullable2.Value - 2;
  }
  public int Count { get; set; }
  public long LongCount { get; set; }
  public int? Nullable1 { get; set; }
  public int? Nullable2 { get; set; }
  public int? Nullable3 { get; set; }
}
public class MasterList
{
  private List<ChildItem> children = new List<ChildItem>();
  public MasterList()
  {
    for (int i = 0; i < 6; i++)
    {
      children.Add(new ChildItem());
    }
    Master1 = "Hi";
    Master2 = "Hi";
    Master3 = "Hi";
    Master4 = "Hi";
    Master5 = "Hi";
    Master6 = "Hi";
    Master7 = "Hi";
    Master8 = "Hi";
    Master9 = "Hi";
    Master10 = "Hi";
    Master11 = "Hi";
    Master12 = "Hi";
  }

  public IEnumerable<ChildItem> Children => children;

  public string Master1 { get; set; }
  public string Master2 { get; set; }
  public string Master3 { get; set; }
  public string Master4 { get; set; }
  public string Master5 { get; set; }
  public string Master6 { get; set; }
  public string Master7 { get; set; }
  public string Master8 { get; set; }
  public string Master9 { get; set; }
  public string Master10 { get; set; }
  public string Master11 { get; set; }
  public string Master12 { get; set; }
}
public class TestIt
{
  private List<MasterList> items = new List<MasterList>(700000);

  public TestIt()
  {
    for (int i = 0; i < 700000; i++)
    {
      items.Add(new MasterList());
    }
    Console.WriteLine("Ready");
  }

  public void StartTest(string text = "Dummy run")
  {
    var enumerator = items.GetEnumerator();

    enumerator.MoveNext();

    List<object> entityBatch = new List<object>();

    Stopwatch sw = new Stopwatch();
    sw.Start();

    for (int iterStep = 0; iterStep < 700000; iterStep++)
    {
      entityBatch.Add(enumerator.Current);
      enumerator.MoveNext();
    }
    sw.Stop();

    Console.WriteLine(text);
    Console.WriteLine("Total time {0}", sw.ElapsedMilliseconds);
  }
}

public partial class DateOfBirth
    {
        public int DateOfBirthId { get; set; }
        public Nullable<int> Day { get; set; }
        public Nullable<int> Month { get; set; }
        public Nullable<int> Year { get; set; }
        public long PepDeskRecordId { get; set; }
    }

public class ExpandedFoo
    {
        
        /// <summary>
        /// Gets or sets a value indicating the Foo Id associated with this person
        /// </summary>
        public string FooId { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the Bar Id (Primary Key) associated with this person
        /// </summary>
        public string BarId { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the title of this person
        /// </summary>
        public string Title { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the gender of this person
        /// </summary>
        public string Gender { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the first name of this person
        /// </summary>
        public string FirstName { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the last name of this person
        /// </summary>
        public string LastName { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the full name of this person
        /// </summary>
        public string FullName { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the other names associated with this person
        /// </summary>
        public string OtherNames { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the Country associated with this person
        /// </summary>
        public string Country { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the Blah Id associated with this person
        /// </summary>
        public string BlahId{ get; set; }

        /// <summary>
        /// Gets or sets a value indicating the Combined name associated with this person
        /// </summary>
        public string CombinedName { get; set; }

        /// <summary>
        /// Gets or sets a value indicating the date of births associated with the Foo
        /// </summary>
        public IEnumerable<DateOfBirth> DateOfBirths { get; set; }
        
        /// <summary>
        /// Initialises a new instance of the <see cref="ExpandedFoo"/> class
        /// </summary>
        public ExpandedFoo()
        {
            this.DateOfBirths = new List<DateOfBirth>();
        }

    }

var expandedEntities = Foontities.Select(entity => new ExpandedFoo
            {
                FooId = entity.fooId.ToString(CultureInfo.InvariantCulture),
                BarId = entity.BarId.ToString(CultureInfo.InvariantCulture),

                Title = entity.Title,
                Gender = entity.Gender,
                FirstName = entity.FirstName,
                LastName = entity.LastName,
                FullName = entity.FullName,

                OtherNames = entity.OtherNames,
                CombinedName = entity.CombinedName,

                Country = entity.Country,

                BlahId=  entity.BlahId.ToString(),

                DateOfBirths = (from DateOfBirth dob in dateOfBirths
                                where dob.FooId== entity.FooId
                                select new FooDateOfBirth()
                                {
                                    DateOfBirthId = dob.DateOfBirthId,
                                    Year = dob.Year,
                                    Month = dob.Month,
                                    Day = dob.Day
                                }).ToList()
            });

DateOfBirths = (from DateOfBirth dob in dateOfBirths
                                where dob.PooId == entity.FooId
                                select new FooDateOfBirth()
                                {
                                    DateOfBirthId = dob.DateOfBirthId,
                                    Year = dob.Year,
                                    Month = dob.Month,
                                    Day = dob.Day
                                })

DateOfBirths = (from DateOfBirth dob in dateOfBirths
                                where dob.FooId == entity.FooId
                                select new FooDateOfBirth()
                                {
                                    DateOfBirthId = dob.DateOfBirthId,
                                    Year = dob.Year,
                                    Month = dob.Month,
                                    Day = dob.Day
                                }) as List<DateOfBirth>

Pete O'Hanlon wrote:

I can make an awful lot of assumptions here

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    IObservable<Point> Moves = Observable.FromEventPattern<MouseEventArgs>(this, "MouseMove").Select(evt=>evt.EventArgs.GetPosition(this));
    var DisposableSubscribtion = Moves.Subscribe(evt => {
        this.Title = evt.ToString();
    });

    DisposableSubscribtion.Dispose();
}

string cmd = "/c" + ConfidenceConnected + file;

/cC:\path\image\ConfidenceConnected.exeC:\path\image\filename output.dcm 100 78

/c "C:\path\image\ConfidenceConnected.exe" "C:\path\image\filename output.dcm" 100 78

string cmd = string.Format("/c \"{0}\" \"{1}\" {2} {3}",  ConfidenceConnected, file, seedX, seedY);

SqlDataSourceEnumerator instance = SqlDataSourceEnumerator.Instance;
DataTable dt = instance.GetDataSources();
foreach (System.Data.DataRow row in dt.Rows)
    {
    Console.WriteLine("ServerName = {0}", row["ServerName"]);
    }

DataTable dt = instance.GetDataSources();