private void studentResult()
        {
            this.chart8.Series["Student"].Points.AddXY("Boys(" + Mgender.ToString() + ")", Mgender);
            this.chart8.Series["Student"].Points.AddXY("Girls(" + (id - Mgender).ToString() + ")", (id - Mgender));

            this.chart9.Series["Result"].Points.AddXY("Pass(" + Passresult.ToString() + ")", Passresult);
            this.chart9.Series["Result"].Points.AddXY("Fail(" + (id - Passresult).ToString() + ")", (id - Passresult));
        }
        private void marks_Calculation()
        {
            int totalStudent = id;

            Passresult = 0;
            Mgender    = 0;

            for (int i = 1; i <= id; i++)
            {
                string          constring   = "datasource=localhost;port=3306;username=root;password=12345";
                string          Query       = "select * from class_database.class_2 where id= '" + i + "' ;";
                MySqlConnection conDatabase = new MySqlConnection(constring);
                MySqlCommand    cmdDatabase = new MySqlCommand(Query, conDatabase);
                MySqlDataReader myReader;
                conDatabase.Open();

                try
                {
                    myReader = cmdDatabase.ExecuteReader();
                    // MessageBox.Show("Data has been Updated " + comboBox1.Text);

                    if (myReader.Read())
                    {
                        //MessageBox.Show("Data has been Updated");
                        //myReader.Read();


                        string gender = myReader.GetString("gender");
                        string result = myReader.GetString("result");
                        if (result == "PASS")
                        {
                            Passresult += 1;
                        }


                        if (gender == "Male")
                        {
                            Mgender += 1;
                        }



                        // myReader.Read();
                    }



                    myReader.Close();
                    conDatabase.Close();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }

            label2.Text = "Number of Student = " + totalStudent.ToString();
            label3.Text = "Number of Boys    = " + Mgender.ToString();
            label4.Text = "Number of Girls   = " + (totalStudent - Mgender).ToString();
            label5.Text = "Number of Passed Student = " + Passresult.ToString();
        }