A Pix-It Pixel.

Pixel.cs

public class Pixel
{
  private readonly int _x;
  private readonly int _y;

  public Pixel(int x, int y)
  {
    _x = x;
    _y = y;
  }

  public int X
  {
    get { return _x; }
  }

  public int Y
  {
    get { return _y; }
  }
}