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List<Form> list = new List<Form>();
foreach (Control ct in panel1.Controls)
{
if (ct.GetType().BaseType.Name == "Form")
{
Form frm = (Form)ct;
list.Add(frm);
}
}
foreach (Form fm in list)
{
fm.Close();
}
Form2 frm = new Form2();
frm.MdiParent = this;
frm.Parent = panel1;
frm.ShowDialog();