在FormLoad里面添加控件时，用this.Controls.Add()方法向窗体里面动态添加控件，调试，一直不显示，后来发现原来窗体上有一个groupbox覆盖了整个窗体，其实控件已经添加上去了，只是被遮盖了。
后面改为this.groupBox1.Controls.Add()，把控件添加到groupbox里面就不会被遮盖了
1 private void UniqueForm_Load(object sender, EventArgs e) 2 { 3 if (pFlag == 1) 4 { 5 Label lbllevel = new Label(); 6 lbllevel.Text = "请设置级数："; 7 lbllevel.Location = new System.Drawing.Point(38, 95); 8 lbllevel.AutoSize = true; 9 lbllevel.Visible = true; 10 txtLevel = new TextBox(); 11 txtLevel.Name = "txtLevel"; 12 txtLevel.Location = new System.Drawing.Point(121, 92); 13 txtLevel.Height = 21; 14 txtLevel.Width = 150; 15 txtLevel.Visible = true; 16 this.groupBox1.Controls.Add(lbllevel); 17 this.groupBox1.Controls.Add(txtLevel); 18 } 19 }