Export offline mobile app datagrid to file able to open in Excel

Question

I created an offline mobile app using Flash and I have a datagrid I would like to export/save as a file (csv maybe) that can later be opened by Excel.  I appreciate any help.

Answer 1

My datagrid looks like this...
Time
Description
Duration
00:03
Loud
4
00:28
Smatter
7
00:50
Medium
10
01:06
Loud
6
02:07
Loud
8
I used this code to create the datagrid...
import fl.data.DataProvider;
import fl.controls.DataGrid;
import fl.controls.dataGridClasses.DataGridColumn;
var historyArray:Array = [];
historyArray = [];
list_history.dataProvider = new DataProvider(historyArray);
var list_history:fl.controls.DataGrid;
list_history.addColumn("Time");
list_history.addColumn("Description");
list_history.addColumn("Duration");
list_history.columns = ["Time", "Description", "Duration"];
I tried modifying the code you shared with me, but I think I am confusing myself more. Do you see where I am making mistakes with the code below?
var data:Array  = [];
   // data header
    data[0] = {a:'Time',b:'Description',c:'Duration'};
    // data body
     for (var i:int = 0;i<list_history.columns.length;i++)
data[i] = {a:list_history.columns.dataField ('Time'),b:list_history.columns.dataField ('Description'),c: list_history.columns.dataField ('Duration')};
//make a csv string
    var csv:String = '';
    for (var i:int = 0;i<list_history.columns.length;i++)
               csv += data[i].a + ',' + data[i].b + ',' + data[i].c+'\n';
    //write to disk
     stage.doubleClickEnabled = true;
     stage.addEventListener(MouseEvent.DOUBLE_CLICK,writeCSV);
    function writeCSV(event:MouseEvent):void
         var file:FileReference = new FileReference();
         var bytes:ByteArray = new ByteArray();
         bytes.writeUTFBytes(csv);
         file.save(bytes,'test.csv');
Thank you for your help on this.