form2 cpt = new form2(this);//form2是子窗体，代码写在父窗体中
                cpt.TopLevel = false;
                cpt.Parent = this.panel1;//要融入的容器panel1
                cpt.WindowState = FormWindowState.Maximized;
                cpt.Dock = DockStyle.Fill;
                cpt.FormBorderStyle = FormBorderStyle.None;
                cpt.Show();