C# - Need to Communicate from Class Instance to the "Parent" Form Object File That Created It

I have created a simple C# Project.  It contains one form (Form1.cs)  and one class (doWork.cs)
file.  In Form1, I create an instance of the class.  I call a property in the class to set an object
reference back to the main form (Form1).  From a private method in the doWork class, I would
like to call a Public method in the form that created the class (Form1).
The code has been copyed from each file and is displayed below:
THANKS.

using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
// START of Form1.cs  object  =======================================================
namespace PtrExample
{
    public partial class Form1 : Form
    {
        doWork MyDoWorkClass = new doWork();
 
        public Form1()
        {
            // allow class instance object to "point back and call methods in this "parent" object
            MyDoWorkClass.PointerToParent = this;
 
            InitializeComponent();
        }
 
        public void ExecuteClassRequest()
        {
            MessageBox.Show("I'M HERE", "NOTICE:");
        }
    }
}
// ========================================================================================
 
 
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
// START of doWork.cs  object  =======================================================
namespace PtrExample
{
    class doWork
    {
        private object mPointerToParent;
 
    
        // property
        public object PointerToParent
        {
           // get { return mPointerToParent; }
           set { mPointerToParent = value; }
        }
 
        // method
 
        private void CallMethodInParent
        {
            // Would like to call method in "parent" that created this class!!!!!!!!
	        // FAILS HERE
	        mPointerToParent.ExecuteClassRequest();
	    }
    }     
}
// ========================================================================================

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