switch (n)
            {
                case 7:
                    {
                        TextBoxLesson8.Text = LessonName[7];
                        TextBoxClass8.Text = ClassID[7];
                        TextBoxNumber8.Text = StuNum[7];
                        TextBoxTime8.Text = WeekTime[7];
                        TextBoxWeeks8.Text = Weeks[7];
                        TextBoxY8.Text = y[7].ToString();
                        TextBoxStaTime8.Text = StaTimes[7];
                    }
                case 6:
                    {
                        TextBoxLesson7.Text = LessonName[6];
                        TextBoxClass7.Text = ClassID[6];
                        TextBoxNumber7.Text = StuNum[6];
                        TextBoxTime7.Text = WeekTime[6];
                        TextBoxWeeks7.Text = Weeks[6];
                        TextBoxY7.Text = y[6].ToString();
                        TextBoxStaTime7.Text = StaTimes[6];
                    }
                case 5:
                    {
                        TextBoxLesson6.Text = LessonName[5];
                        TextBoxClass6.Text = ClassID[5];
                        TextBoxNumber6.Text = StuNum[5];
                        TextBoxTime6.Text = WeekTime[5];
                        TextBoxWeeks6.Text = Weeks[5];
                        TextBoxY6.Text = y[5].ToString();
                        TextBoxStaTime6.Text = StaTimes[5];
                    }
                case 4:
                    {
                        TextBoxLesson5.Text = LessonName[4];
                        TextBoxClass5.Text = ClassID[4];
                        TextBoxNumber5.Text = StuNum[4];
                        TextBoxTime5.Text = WeekTime[4];
                        TextBoxWeeks5.Text = Weeks[4];
                        TextBoxY5.Text = y[4].ToString();
                        TextBoxStaTime5.Text = StaTimes[4];
                    }
                case 3:
                    {
                        TextBoxLesson4.Text = LessonName[3];
                        TextBoxClass4.Text = ClassID[3];
                        TextBoxNumber4.Text = StuNum[3];
                        TextBoxTime4.Text = WeekTime[3];
                        TextBoxWeeks4.Text = Weeks[3];
                        TextBoxY4.Text = y[3].ToString();
                        TextBoxStaTime4.Text = StaTimes[3];
                    }
                case 2:
                    {
                        TextBoxLesson3.Text = LessonName[2];
                        TextBoxClass3.Text = ClassID[2];
                        TextBoxNumber3.Text = StuNum[2];
                        TextBoxTime3.Text = WeekTime[2];
                        TextBoxWeeks3.Text = Weeks[2];
                        TextBoxY3.Text = y[2].ToString();
                        TextBoxStaTime3.Text = StaTimes[2];
                    }
                case 1:
                    {
                        TextBoxLesson2.Text = LessonName[1];
                        TextBoxClass2.Text = ClassID[1];
                        TextBoxNumber2.Text = StuNum[1];
                        TextBoxTime2.Text = WeekTime[1];
                        TextBoxWeeks2.Text = Weeks[1];
                        TextBoxY2.Text = y[1].ToString();
                        TextBoxStaTime2.Text = StaTimes[1];
                    }
                case 0:
                    {
                        TextBoxLesson1.Text = LessonName[0];
                        TextBoxClass1.Text = ClassID[0];
                        TextBoxNumber1.Text = StuNum[0];
                        TextBoxTime1.Text = WeekTime[0];
                        TextBoxWeeks1.Text = Weeks[0];
                        TextBoxY1.Text = y[0].ToString();