string mysql = string.Format("SELECT Cname,Grade FROM student,score,course WHERE student.Sno = score.Sno and score.Cno = course.Cno and student.Sno = '{0}' and score.Text = {1}",textbox1.Text,ComboBox1.Text);
string mysql = "SELECT Cname,Grade FROM student,score,course WHERE student.Sno = score.Sno and score.Cno = course.Cno and student.Sno =‘" +Convert.ToString(textBox1.Text) +"’ and score.Text =‘" + Convert.ToInt32(comboBox1.Text)“’;”;
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