How to update a child form label.text? when the child form is allready open and you click on the parent form menu?

How to update child form from Parent form when child form is allready open?
How to know wich child forms are open and in that case update them all?
portilloleopoldoAsked:
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GrumbleBotConnect With a Mentor Commented:
Here is one way of doing this.

      Form[] ar = this.MdiChildren;
      for(int i=0; i<ar.Length; i++)
          ar[i].Text = "Hello";
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GrumbleBotCommented:
if you don't want to update hidden child forms you could also do soumething like this.

if(ar.Visible == true)
     ar[i].Text = "Hello";


hope this helps.
Good luck
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vinhnlCommented:
I think you should use event to do this
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vinhnlConnect With a Mentor Commented:
In MDIParentForm:

public event EventHandler ChangeTextChildrent;
private void ChangeTextMyChildrent_Click(object sender, System.EventArgs e)
{
     if(ChangeTextChildrent != null)
          ChangeTextChildrent(this,null);
}

when new childrent form:

this.IsMdiContainer = true;
ChildrentForm newform = new ChildrentForm();
newform.IsMdiChild = true;
newform.MdiParent = this;
this.ChangeTextChildrent += new EventHandler(newform.ChildrentForm_ChangeText);
newform.Show();

In ChildrentForm:

public void ChildrentForm_ChangeText(object sender, EventArgs e)
{
    Label1.Text = "Hello";
}

Good Luck,
VINHNL
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