private void label4_TextChanged(object sender, EventArgs e) { if (Convert.ToInt32(label4.Text) == -1) { label5.Visible = false; label6.Visible = false; label13.Visible = false; label14.Visible = false; } else { label5.Visible = true; label6.Visible = true; label13.Visible = true; label14.Visible = true; Automobil auto = new Automobil(); int pogonMotor = Convert.ToInt32(label4.Text); DataTable dr = auto.DohvatiPogonMotor(pogonMotor); label5.Text = dr.Rows[0].Field <string>(0); label6.Text = dr.Rows[0].Field <string>(1); } }