private void button1_Click(object sender, EventArgs e) { DataTable dt2 = db.select_questions(username.Text); foreach (DataRow dr in dt2.Rows) { if (dr[0].ToString() == comboBox1.SelectedItem.ToString() && dr[1].ToString() == textBox1.ToString()) { label1.Text = "Password is " + dr[2].ToString(); label1.Visible = true; } else { label1.Text = "Something is wrong"; label1.Visible = true; } } this.Refresh(); }