1   #region 关闭前面的窗体打开新窗体
 2         //关闭前面的窗体
 3         private void ClosePreForm()
 4         {
 5             //首先判断当前容器中是否存在窗体
 6             foreach (Control item in this.spContainer.Panel2.Controls)
 7             {
 8                 if (item is Form)
 9                 {
10                     Form objControl = (Form)item;
11                     objControl.Close();
12                 }
13             }
14         }
15 
16         //打开窗体
17         private void OpenForm(Form objFrm)
18         {
19             objFrm.TopLevel = false;//将子窗体设置为*控件
20             objFrm.WindowState = FormWindowState.Maximized;//让子窗体最大化
21             objFrm.FormBorderStyle = FormBorderStyle.None;//去掉窗体的边框
22             objFrm.Parent = this.spContainer.Panel2;//定义子窗体显示的容器
23             objFrm.Show();
24         }
25         #endregion

1   private void btnAddStudent_Click(object sender, EventArgs e)
2         {
3             ClosePreForm();
4             OpenForm(new FrmAddStudent());
5         }