C#

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"When the only tool you have is a hammer, a sore thumb you will have."

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"When the only tool you have is a hammer, a sore thumb you will have."

System.Xml.XmlDocument d = new System.Xml.XmlDocument();
//load
d.Load(@"c:\opml.xml");

// add a dummy attribute to each outline node
XmlNodeList elemList = d.GetElementsByTagName("outline");
for (int i=0; i < elemList.Count; i++)
  elemList[i].Attributes.Append( d.CreateAttribute("myattrib") );

// overwrite
d.Save(@"c:\opml.xml");

class SecondForm : Form
{
   ...
   ...
   public AdvancedInfo GetAdvancedInfo()
   {
    ...
    ...
   }
   ...
   ...
}

class FirstForm : Form
{
   ...
   SecondForm mySecondForm;
   ...
   ...
   void SomeMethodThatNeedsAdvancedInfo()
   {
     AdvancedInfo info = mySecondForm.GetAdvancedInfo();
     ...
   }
}

public class form2 : Form
{
   //publish a FormChanged event
   public event EventHandler FormChanged;
   ...
   ...
   protected void SomeClassThatChangesForm2()
   {
   ...
   ...
      //we just did something that changed this form, so
      //we'll fire the FormChanged event to inform subscribers
      if( FormChanged != null ) //if we have subscribers
         FormChanged( this, new EventArgs() ) //fire the event
   ...
   }
   ...
}

public class form1 : Form
{
   ...
   ...
   protected void Form2ChangedHandler( object sender, EventArgs e )
   {
      //if we are in this handler, it means that we've 
      //recieved the FormChanged event 
      ...
      //deal with the event
      ...
   }
   ...
   ...
   //constructor
   public form1()
   {
      ...
      //subscribe to form2's event, specifying the handler
      //as the protected Form2ChangedHandler method
      this.form2.FormChanged += 
         new EventHandler( Form2ChangedHandler );
      ...
   }
   ...
}