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private void OpenForm(Form form)
{
panel.Controls.Clear();
form.TopLevel = false;
form.Dock = DockStyle.Fill;
form.FormBorderStyle = FormBorderStyle.None;
form.WindowState = FormWindowState.Maximized;
panel.Controls.Add(form);
form.Show();
}
foreach (Control control in panel.Controls)
{
if (control is Form f)
{
f.Dispose();
GC.Collect();
}
}