public class Point
{
    private int iX;
    private int iY;
    public Point(int pX, int pY)
    {
        iX = pX;
        iY = pY;
    }
    public int X
    {
        get { return iX;  } 
        set { iX = value; }
    }
    ...
} 
...
Point tPoint = new Point(100, 200);
int tX = tPoint.X;    // uses get
tPoint.X = 150;       // uses set
tPoint.X++;           // uses get and set