parent and child window forms..

See more:

C#

.NET

WinForms

I have 3 window forms parent form, child form and 3rd is sample form.
i have opened child form in parent form by using parent MenuStrips option .following code is used ...

private void ChildFormToolStripMenuItem_Click(object sender, EventArgs e)
{
foreach (var child in this.MdiChildren)
{ child.Close(); }
this.menuStrip1.MdiWindowListItem = ChildFormToolStripMenuItem;
ChildForm Cf = new ChildForm();
Cf.MdiParent=this;
Cf.Show();
Cf.WindowState = FormWindowState.Maximized;
}

this is working properly..
now i want to open 3rd sample form in parent form by clicking a button on child form.

From a button on child form i want to open a 3rd sample form inside parent form.

thank you.