Windows窗体调整框架,没有标题栏？

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.MenuStrip = null;

this.Controls.Clear();

// 创建控件并将它们添加到窗体中
var control1 = new Panel();
control1.AutoSize = true;
control1.BackColor = System.Drawing.SystemColors.ControlDark;
control1.BorderStyle = BorderStyle.None;
this.Controls.Add(control1);

var control2 = new Panel();
control2.AutoSize = true;
control2.BackColor = System.Drawing.SystemColors.Control;
control2.BorderStyle = BorderStyle.FixedSingle;
this.Controls.Add(control2);