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Close parent and child Form C#

Hi, I'm currently handling with 3 Forms.
A Main Form,Parent Form and a child Form.
The relation is the Main form has a link to the parent form.
The Parent Form links to a Child Form after a button event.

My question is How can Close the ChildForm and ParentForm at the same time when I close the ChildForm?

//Main Form link
            parentForm Pdetails = new  parentForm();
            Pdetails.ShowDialog();
            Pdetails.Dispose();
 
//Parent Form
                childForm Cconfirm = new childForm(confirmlist);
                Cconfirm.Show();
 
//Child Form (How to close ParentForm also???)
            this.DialogResult = DialogResult.Cancel;
            this.Close();

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ASKER CERTIFIED SOLUTION

Dmitry G

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csharp_learner

ASKER

Thanks for the reply,I followed your step but my parent Form
private void newDataPoint_Click(object sender, EventArgs e)
{
MyChildForm child = new MyChildForm();
child.ShowDialog();
child.Dispose();
}
"MyChildForm child = new MyChildForm();"does not take '0' arguments.What should I include inside?
I tried MyChildForm child = new MyChildForm(this); but doesn't work

csharp_learner

ASKER

my bad MyChildForm child = new MyChildForm(this); worked.