protected void saveButton_Click(object sender, EventArgs e)
        {
            if (!IsValid)
            {
              return;
            }

            try
            {
                Course aCourse = new Course();
                aCourse.CourseCode = codeTextBox.Value;
                aCourse.CourseName = titleTextBox.Value;
                aCourse.Credit = Convert.ToDouble(creditTextBox.Value);
                aCourse.Description = descriptionTextBox.Value;
                aCourse.CourseStatus = 0;
                aDepartmentManager = new DepartmentManager();

                aCourse.ADepartment = aDepartmentManager.GetDepartment(Convert.ToInt16(departmentDropDownList.Text));
                SemesterManager aSemesterManager = new SemesterManager();
                aCourse.ASemester = aSemesterManager.GetSemester(Convert.ToInt16(semesterDropDownList.Text));
                CourseManager aCourseManager = new CourseManager();
                string msg = aCourseManager.SaveCourse(aCourse);

                if (msg == "Saved")
                {
                    msgLabel.ForeColor = Color.Green;
                    msgLabel.Text = msg;
                    ClearAllTextBoxes();
                }
                else
                {
                    msgLabel.ForeColor = Color.Red;
                    msgLabel.Text = msg;

                }

            }

            catch (SqlException sqlException)
            {
                msgLabel.ForeColor = Color.Red;
                msgLabel.Text = "Database error.See details error: " + sqlException.Message;

            }
            catch (Exception exception)
            {
                msgLabel.ForeColor = Color.Red;
                string errorMessage = "Unknow error occured.";
                errorMessage += exception.Message;
                if (exception.InnerException != null)
                {
                    errorMessage += exception.InnerException.Message;
                }
                msgLabel.Text = errorMessage;
            }
        }