protected void saveButton_Click(object sender, EventArgs e)
        {
            try
            {
                StudentResult aStudentResult = new StudentResult();
                aStudentResult.DepartmentId = Convert.ToInt16(departmentDropDownList.Text);
                aStudentResult.CourseId = Convert.ToInt16(courseDropDownList.Text);
                aStudentResult.RegistationNo = regNoTextBox.Value;
                aStudentResult.GradeLetter = gradeLetterDropDownList.SelectedItem.Text;
                ResultManager aResultManager = new ResultManager();
                string msg = aResultManager.SaveASubjectGrade(aStudentResult);
                if (msg == "Saved")
                {
                    msgLabel.ForeColor = Color.Green;
                    msgLabel.Text = msg;
                }
                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;
            }
        }