C#

private object _yourobject;
 
public object YourObject
{
    get
    {
        return _yourobject;
    }
    set
    {
        if(value!=_yourobject)
        {
            _yourobject = value;
            //Fire your event here
        }
    }
}

    public class testClass 
    {
        public int s1 = 0;
        public int s2 = 0;
        public int s3 = 0;

    }

private testClass Mumu=new testClass ();

        public testClass mumu       
        {
            set
            {
                //can put here one event, function ....
                MessageBox.Show("bingo");
                Mumu = value;
            }
            get
            {
                //can put here one event, function ....
                MessageBox.Show("bingo");
                return Mumu;
            }
        }

................

        private void button2_Click(object sender, EventArgs e)
        {
            mumu.s1 = 10;
        }

Martin# wrote:

What do you mean with "program"?
A class or an project?

XmlReader reader = null;
try
{
  reader = new XmlTextReader(link);
}
catch (WebException)
{
  link = link.Replace("AAA","XXX");
  reader = new XmlTextReader(link);
}