C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace Modales_window
{
    public partial class Form2 : Form
    {
        public delegate void ClosingEventHandler();
        public event ClosingEventHandler closingeventhandler;

        public Form2()
        {
            InitializeComponent();
        }

        protected virtual void OnClosingEventHandler()
        {
            if (closingeventhandler != null)
            {
                closingeventhandler();
            } 
        }

        private void ModalesWindow2_FormClosing(object sender, FormClosingEventArgs e)
        {
            OnClosingEventHandler();
        }
    }
}

public Form1()
{
    mw2.closingeventhandler += new Form2.ClosingEventHandler(mw2_closingeventhandler);
    InitializeComponent();
}
void mw2_closingeventhandler()
{
    mw2.Dispose();
    // this is how i tried to free up the recources.
    // but this causes a loop error : (
}

private void button1_Click(object sender, EventArgs e)
{
    // Cannot access a disposed object.
    // Object name: 'Form2'.
    if (!mw2.Created)
    {
        mw2.Show();
    }
    else
    {
        //MessageBox.Show("already open", "", MessageBoxButtons.OK, MessageBoxIcon.Information);
        if (mw2.Visible == true)
        {
            mw2.Visible = false;
        }
        else
        {
            mw2.Visible = true;
        }
    }
}

private void ModalesWindow2_FormClosing(object sender, FormClosingEventArgs e)
{
    OnClosingEventHandler();
    e.Cancel = true; // <--- surpresses the cancel event
    this.Hide();
}

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Modales_window
{
    public partial class Form1 : Form
    {

        Form2 mw2 = new Form2();

        // Form1 form = (Form1)Application.OpenForms[0];
        // Form2 form2 = (Form2)Application.OpenForms[1];

        public Form1()
        {
            mw2.closingeventhandler += new Form2.ClosingEventHandler(mw2_closingeventhandler);
            InitializeComponent();
        }
        void mw2_closingeventhandler()
        {
            //mw2.Dispose();
            //mw2.Hide();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            // Cannot access a disposed object.
            // Object name: 'Form2'.
            if (!mw2.Created)
            {
                mw2.Show();
            }
            else
            {
                //MessageBox.Show("already open", "", MessageBoxButtons.OK, MessageBoxIcon.Information);
                if (mw2.Visible == true)
                {
                    mw2.Visible = false;
                }
                else
                {
                    mw2.Visible = true;
                }
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = Application.OpenForms.Count.ToString();
            GetOpenFormTitles();
        }

        private void GetOpenFormTitles()
        {
            Collection<string> formTitles = new Collection<string>();
 
            try 
            {
                foreach (Form f in Application.OpenForms) 
                {
                    // Use a thread-safe method to get all form titles.
                    formTitles.Add(GetFormTitle(f));
                }
            }
            catch (Exception ex) 
            {
                formTitles.Add("Error: " + ex.Message);
            }

            this.listBox1.DataSource = formTitles;
        }
    
        private delegate string GetFormTitleDelegate(Form f);
        private string GetFormTitle(Form f)
        {
            // Check if the form can be accessed from the current thread.
            if (!f.InvokeRequired) 
            {
                // Access the form directly.
                return f.Text;
            }
            else 
            {
                // Marshal to the thread that owns the form. 
                GetFormTitleDelegate del = GetFormTitle;
                object[] param = { f };
                System.IAsyncResult result = f.BeginInvoke(del, param);
                // Give the form's thread a chance process function.
                System.Threading.Thread.Sleep(10);
                // Check the result.
                if (result.IsCompleted) 
                {
                    // Get the function's return value.
                    return "Different thread: " + f.EndInvoke(result).ToString();
                }
                else 
                {
                    return "Unresponsive thread";
                }
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            mw2.Close();
            //mw2.Dispose(); // causes the famous 'Cannot access a disposed object.' again 
        }
    }
}

1. Get the class' Type
2. Get the EventInfo representing m_Event of that Type
3. Iterate from one to eight


1. Get the method "Func_" + i.ToString()
2. Use Delegate.CreateDelegate(typeof(MyEvent), [MethodInfo you just retrieved in the last step])
3. Store the return value of that function call in a variable
4. Call the AddEventHandler(this, [Delegate you just created and stored in a variable])