private void cmb_name_SelectedIndexChanged(object sender, EventArgs e) { txt_fee.Text = d.singleString("SELECT course_fee FROM Course_details_master WHERE course_no='" + General_methods.get_course_no_from_course_name(cmb_name.Text) + "'"); txt_registration_fee_txt.Text = d.singleString("SELECT reg_fee FROM Course_details_master WHERE course_no='" + General_methods.get_course_no_from_course_name(cmb_name.Text) + "'"); cmb_medium.DataSource = General_methods.fill_course_mediums_combobox(General_methods.get_course_no_from_course_name(cmb_name.Text)); cmb_medium.SelectedIndex = 0; }