public void ComboBoxSelectionFilter(RadioButton allCourse, RadioButton jCourse, RadioButton sCourse, string comboBoxText, DataGridView firstDGV)
        {
            SQLConnectionQueries sqlConnectionQueries = new SQLConnectionQueries();

            if (allCourse.Checked == true)
            {
                string level = "J' or Level = 'S";
                sqlConnectionQueries.RadioButtonFilter(comboBoxText, level, firstDGV);
            }
            else if (jCourse.Checked == true)
            {
                string level = "J";
                sqlConnectionQueries.RadioButtonFilter(comboBoxText, level, firstDGV);
            }
            else if (sCourse.Checked == true)
            {
                string level = "S";
                sqlConnectionQueries.RadioButtonFilter(comboBoxText, level, firstDGV);
            }
        }
        private void JCoursesRB_CheckedChanged(object sender, EventArgs e)
        {
            string level = "J";

            sqlConnectionQueries.RadioButtonFilter(coursesComboBox.Text, level, availCourseDGV);
        }