Button Pressing with Counter

 trying lcd print different each time button pressed. once clicked remains in first while loop , despite clicking again, doesn't register. assume because haven't got button pressing function within loop when copy first half of code loop still doesn't work. how can register click has been made within loop

code: [select]

buttonstate = digitalread(buttonpin);

  if (buttonstate != lastbuttonstate) {
    if (buttonstate == high) {
      buttonpushcounter++;
    }
    delay(50);
  }

-------------------------------------------------------------------------------

  while ((voltage < 6) && (buttonpushcounter == 1))
  {
    lcd.clear();
    lcd.setcursor(0, 0);
    lcd.print(string("menu 1"));
    delay(5000);
  }
  while (buttonpushcounter == 2)
  {
    lcd.clear();
    lcd.setcursor(0, 0);
    lcd.print(string("menu 2"));
    delay(5000);
  }

you forgot update lastbuttonstate.

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