private void btnOrderDetails_Click(object sender, EventArgs e)
{
Form form = Application.OpenForms["MDIForm"];
OrderDetailForm detailForm = new OrderDetailForm(int.Parse(txtOrderId.Text));
detailForm.MdiParent = form;
detailForm.Show();
}
private void btnOrderManager_Click(object sender, EventArgs e)
{
Form form = Application.OpenForms["MDIForm"];
OrderDetailForm detailForm = new OrderDetailForm();
detailForm.MdiParent = form;
detailForm.Show();
}