using CDSAE3_Lian_Lian_Kan.Forms; namespace CDSAE3_Lian_Lian_Kan { public partial class LianLianKan : Form { public LianLianKan() { InitializeComponent(); current_form = this; change_form(new Leisure_Mode_MenuForm()); Settings.form = this; } Form current_form; public void change_form(Form form) { if (current_form == form) return; current_form = form; MainPanel.Controls.Clear(); form.TopLevel = false; form.Dock = DockStyle.Fill; MainPanel.Controls.Add(form); GC.Collect(); form.Show(); } } }