Access the containing forms control

Question

I am working on a project where I have a main form and inside the main form, I have a panel where I am opening a form, then closing it and opening a new form. For closing and opening, I have created a generic method which is as below

// for first time use when only form is to open and no form is to close   
     public static void showwindow(Form openwin, Panel p)  
    {  
        openwin.TopLevel = false;  
        p.Controls.Add(openwin);  
        openwin.WindowState = FormWindowState.Maximized;  
        openwin.ControlBox = false;  
        openwin.BringToFront();  
        openwin.Show();  
    }  

  // for subsequent uses when i have to close the current form, opens a new form inside the panel3   
   public static void showwindow(Form openwin , Form closewin , Panel p)  
    {  
        closewin.Close();  
        openwin.TopLevel = false;  
        p.Controls.Add(openwin);  
        openwin.WindowState = FormWindowState.Maximized;  
        openwin.ControlBox = false;  
        openwin.BringToFront();  
        openwin.Show();             
    }  

now the problem is, I am unable to access the owner form's panel when i am inside the second form . The panels name is always "panel3" .

Answer 1

Thanks everyone, I found the answer on stackoverflow . I am posting here to help the new community members. It's my request to the senior members here to please spare some time to improve the below answer.

Panel P = this.Parent as Panel;  
        if(P!=null)  
        {  
            sale_purchase sp = new sale_purchase();  
            code.logics.showwindow(sp, this, P);  
        }  


public static void showwindow(Form openwin , Form closewin , Panel p)  
 {  
     closewin.Close();  
     openwin.TopLevel = false;  
     p.Controls.Add(openwin);  
     openwin.WindowState = FormWindowState.Maximized;  
     openwin.ControlBox = false;  
     openwin.BringToFront();  
     openwin.Show();             
 }