How to remove/destroy previous object from memory

Question

hi guys, I am getting problem of memory of having repeating object.
Below is my code.
import flash.system.System;
var counter:Number=0;
var systemMemory:TextField=new TextField();
systemMemory.x=200;
stage.addEventListener(Event.ENTER_FRAME,showNext);
function showNext(event:Event){
    var myTxt:TextField=new TextField();
    myTxt.text=counter.toString();
    myTxt.width=100;
    myTxt.height=20;
    myTxt.x=Math.random()*100;
    systemMemory.text="Total Memory Used :"+System.totalMemory.toString();
    systemMemory.width=300;
    addChild(systemMemory);
    addChild(myTxt);
    counter++;
Above code does repeat textField Object continuously. Now I want to destroy previous created textField Object. So that my memory will not be hang. I got some where in the blog that with System.gc()  could clear garbage collection. But currently I am not working with system.gc any more I want to clear previous object in programatically way. Is there any way that I could destroy previous created object ?

Answer 1

ok, thanks for your kind replay. Above is my test case. Actually, I need to do show 4 texfield in each FRAME_ENTER with different text properties's value + previous textFields should be remove and comes next 4 textField.
import flash.text.TextField;
import flash.display.Sprite;
import flash.display.Stage;
import flash.events.Event;
import flash.system.System;
var frameNo:Number=0;
var txtFieldGroup:Array=new Array();
var mem:TextField=new TextField();
stage.addEventListener(Event.ENTER_FRAME,showTxtFields);
function showTxtFields(event:Event):void{
    var eachGap:Number=100*frameNo;
    /* Removing data from txtFieldGroup if there any data */
    if(txtFieldGroup.length>0){
        txtFieldGroup.length=0;
    /* created textField objects and set it in an array */
    for(var i:Number=0; i<4; i++){   
        /*txtFieldGroup[frameNo][i]=frameNo.toString()+":"+i.toString();*/
        txtFieldGroup[i]=new TextField();
        txtFieldGroup[i].text=frameNo.toString()+i.toString();
        txtFieldGroup[i].y=(20*i)+eachGap;
        addChild(txtFieldGroup[i]);
    // System Memory Message
    mem.text="System Memory: "+System.totalMemory;
    mem.x=250;
    mem.width=300;
    addChild(mem);
    // Frame No increment
    frameNo++;
here, from above script it created 4 txtObject in each frame no. I have clear array in each frame no. But I could not remove textFieldObject from CPU Memory. As you can see textField object of mem. As you say in earlier post making 4 different textfield at initialy  is nice option to control over CPU Memory. Is there any technique so that I could remove previous created textField object because . I am also having problem why my textfields are shows more than 4. I was expecting only 4 textField in each frame. Please you suggestion is required. Thanks for studying my confusion.