c# How do I have Form1 send data to other forms

Form1 creates multiple instances of Form2
Button1 on Form1 populates a textbox on Form2 but not every instance - just one or two of them depending on the situation.
How do I do this?
pderingAsked:
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käµfm³d 👽Commented:
The same way as was described in your other question:  http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_27629120.html
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pradhanvCommented:
While you create the child forms pass the reference of the parent form to them.
On click of the button in the main form throw an event. Now listen to these events in the child form and execute whatever you want depending on the situation.

using System;
using System.Threading;
using System.Collections;
using System.Collections.Generic;
using System.Windows.Forms;

namespace QuickTest {
    
    public class Class1  {
       
        public static void Main() {
            System.Console.WriteLine("Hello World!");
            Form1 f = new Form1();
            Application.Run(f);

            System.Console.ReadLine();
        }
    }
}

class Form1 : Form
{
 public delegate void ButtonClickedHandler(int i);
 public event ButtonClickedHandler ButtonClicked;
 int i=0;

 public Form1()
 {
  Button b = new Button();
  b.Click+=new EventHandler(this.Button_Clicked);
  this.Controls.Add(b);
  for(int i=0; i<3; i++)
  {
   new Form2(this).Show();
  }

}
 
 private void Button_Clicked(object o, EventArgs a )
 {
  if(ButtonClicked!=null)ButtonClicked(i++);
 }
}

class Form2 : Form
{
 RichTextBox a ;
 public Form2(Form1 f)
 {
  a = new RichTextBox();
  this.Controls.Add(a);
  f.ButtonClicked+=new Form1.ButtonClickedHandler(this.FillTextArea);
 }
 private void FillTextArea(int i)
 {
a.AppendText(""+i);
 }

}

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pradhanvCommented:
Hi pdering,
Did the posts answer your question ?
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