listener c# like java

Answer 1

Hi, take a look at this link
http://www.switchonthecode.com/tutorials/csharp-snippet-tutorial-custom-event-handlers

Answer 2

Hi, You can put an event at the setter as follows. The event will be fired every time the setter is called.

public class MyObj
{
    private RectangleF mRectangle;

    public event EventHandler RectangleChanged;

    public RectangleF Rectangle
    {
        get
        {
            return mRectangle;
        }

        set
        {
            mRectangle = value;
            OnRectangleChanged();
        }
    }

    protected virtual void OnRectangleChanged()
    {
        if (RectangleChanged != null)
        {
            RectangleChanged(this, EventArgs.Empty);
        }
    }
}