RowCount Of DataGridview is Always One when called in other form

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Windows

C#3.5

application

I have MainForm and Form2 is displayed in panel of Mainform.(Looks like MDI form but not MDI as I have heard that MDIForm is bad idea)


When I Check the RowCount Of datagridview1 displayed on Form2 in Mainform.cs or
any other form the datagridview1.RowCount is always one.

I have also found that Form2.IsHandleCreated is always false .Even If I see the Form2 displayed in Mainform panel.

So I have created handle by CreateControl method for Form2 and datagridview1.

but still Form2.IsHandleCreated is false.
datagridview1.ISHandle is false ALWAYS.WHY?WHY?WHY?.
also tried
I have tried a lot but not found any solution for this.


And I know how to use delegate to write values from different thread.
I have written values of Maindatagridview from thread because I can see Its
RowCount is What I have entered(more than one).

So I only want the solution for why RowCount is always one in Child Form2.
This is happening with every child form.
Becasue of this problem I am not able to write values to datagridview from any other
form ,even from Mainform.

Question Improved

//
Code 1
How I have created Form2 In MainForm

private Form CreateForm(ControlsEnum frm)
        {
            switch (frm)
            {
                case ControlsEnum.Form2:
                    return new Form2();
                 case... number of forms
                 default: return null;
            }
         }

public void ShowForm(ControlsEnum frm)
       {

           Form new_Frm = null;

          //If dictionary already contains instance of //Idictionary Interface is used
           if (controls.ContainsKey(frm))
           {

               new_Frm = controls[frm];
           }
           else
           {
               new_Frm = CreateForm(frm);
               controls[ctrl] = new_Frm;
               new_Frm.TopLevel = false;
           }

           new_Frm.Parent = this;
           new_Frm.Dock = DockStyle.Fill;
           new_Frm.BringToFront();

           ShowFormPanel_PNL.Controls.Add(new_ctrl); //this panel is in Mainform
        
            new_ctrl.Show();
      
         ////I have use stack to remove previos form //code deleted

       }

void  Mainform_Load()
{
  //  ShowForm(ControlEnum.Form2);
  if replaced the above line with below code I get results
            f2 = new Form2();
            f2.TopLevel = false;
            ShowFormPanel_PNL.Controls.Add(f2);
            f2.Show();
}

// When Form2 and Mainform displayed. I add dynamically rows to gridview from a button on Form2.
//then I click MainFormbutton1

private void MainFormbutton1_Click(object sender, EventArgs e)
{
           Program.f2 = f2;
           int x= Program.f2.From2GridView.Rows.Count; 
           int y = f2.From2GridView.Rows.Count; 
          // I can see the expected result.
          // but if replaced with ShowForm Rowcount is always 1.
}