C#

Size.Height = 100;
Size.Width = 100;

Location.X = 100;
Location.Y = 100;

Size size = Size;
Point location = Location;

Size = new Size( 100, 100 );
Location = new Point( 100, 100 );

partial class Control
{
  public Size Size { get; set; }
  public Point Location { get; set; }
}

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Be excellent to each other

public class MyControl : Control
{
    public event EventHandler IDChanged;

    private static readonly Size MyDefaultSize = new Size(150, 50);

    public const int MaxID = int.MaxValue;
    public const int MinID = 0;

    private int id;

    // replaced property
    public new Size Size
    {
        get { return base.Size; }
        set { base.Size = value; }
    }
    // overriden (readonly) property
    protected override Size DefaultSize
    {
        get { return MyDefaultSize; }
    }
    // original property
    public int ID
    {
        get { return id; }
        set
        {
            if (value < MinID || value > MaxID)
                throw new ArgumentOutOfRangeException(
                    "ID",
                    string.Format(
                        "ID must be between {0} and {1}",
                        MinID, MaxID));
            if (id != value)
            {
                id = value;
                OnIDChanged(EventArgs.Empty);
            }
        }
    }

    protected virtual void OnIDChanged(EventArgs e)
    {
        EventHandler eh = IDChanged;
        if (eh != null)
            eh(this, e);
    }
}

string original = ...;

string spaced = String.Join( "\n", original.Split( '\n' ).Select( s => " " + s ).ToArray() );

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Be excellent to each other

var nullableDoubles = new double?[2][];
nullableDoubles[1] = new double?[]{null, 1.1, null, 1.2};

double[][] nonNullableDoubles = nullableDoubles.Select(doubleArray=>{
        if(doubleArray==null)
            return null;
        else
           return doubleArray.Where(doubleValue => doubleValue.HasValue).Cast<double>().ToArray();}).ToArray();