private void HideForm(object sender, EventArgs e)
 {
     this.WindowState = FormWindowState.Minimized;
     fParent.Dispose();
     fParent = null;
     this.Dispose();
     this.Close();
 }
        //确定下课
        private void pictureBox_lessonover_btn_Click(object sender, EventArgs e)
        {
            //TODO: 下课事件处理
            Form1.ShowController(false);

            this.WindowState = FormWindowState.Minimized;
            fParent.Dispose();
            fParent = null;
            this.Dispose();
            this.Close();
            Common.setLessonOff(0, "", "");
        }