Upload - Download File with Parse in Unity

using UnityEngine;
using System.Collections;
using System;
using System.Collections.Generic;
using System.IO;
using Parse;

public class ParseBigFile : MonoBehaviour {

    //String linkdownload = "http://files.parsetfss.com/8d7d8fb2-b0bc-4d95-9463-7b2397d0e7ae/tfss-d1e15eac-8c8a-43fd-845b-5f0cf4051b8a-LuongDuLieu.txt";
    String linkdownload = "";

    // Use this for initialization
    void Awake()
    {
        print("Running..");
    }

    void Start() {
        // upload file with parse
        /*
        int soto = 1;
        for (int i = 0; i < soto; i++) {
            //byte[] data = System.Text.Encoding.UTF8.GetBytes("File DataUser Client " + i);
            //ParseFile file = new ParseFile("resume.txt", data);

            String nameFile = "LuongDuLieu.txt";
            String filename = Application.persistentDataPath + "/" + nameFile;
            byte[] bytes = System.IO.File.ReadAllBytes(filename);
            ParseFile file = new ParseFile(nameFile, bytes);

            ParseObject gameScore = new ParseObject("TestBigData");
            gameScore["file"] = file;
            gameScore["id_facebook"] = "idfb " + i;
            gameScore["score"] = i;
            gameScore["level"] = i;

            gameScore.SaveAsync();

            print("i= " + i + " time = " + Time.deltaTime);


        }
        */

        // write file
        /*
        ParseQuery<ParseObject> query = ParseObject.GetQuery("TestBigData");
        query.GetAsync("A04WgJ976D").ContinueWith(t =>
        {
            ParseObject obj = t.Result;

            int level = obj.Get<int>("level");
            string id_facebook = obj.Get<string>("id_facebook");
            ParseFile file = obj.Get<ParseFile>("file");
            print("level = " + level);
            print("id_facebook = " + id_facebook);
            print("file = " + file.Url.AbsoluteUri);

            linkdownload = file.Url.AbsoluteUri;



        });


        String linkUrl = "http://files.parsetfss.com/8d7d8fb2-b0bc-4d95-9463-7b2397d0e7ae/tfss-d1e15eac-8c8a-43fd-845b-5f0cf4051b8a-LuongDuLieu.txt";
        WWW www = new WWW(linkUrl);
        StartCoroutine(Download(www));
        */

        // download file with parse
        StartCoroutine(LoadFile());
    }


    IEnumerator Download(WWW www)
    {
        yield return www;
        print("du lieu = " + www.text);
        byte[] bytes = null;
        bytes = www.bytes;

        String filename = Application.persistentDataPath + "/" + "LuongDuLieu.txt";

        System.IO.File.WriteAllBytes(filename, bytes);

    }

    //void Update() { StartCoroutine(LoadFile()); }

    IEnumerator LoadFile()   //single method downloads file
    {
        Debug.Log("LoadFile()");

        ParseQuery<ParseObject> query = ParseObject.GetQuery("TestBigData").WhereEqualTo("objectId", "A04WgJ976D");

        var queryTask = query.FirstAsync();
        while (!queryTask.IsCompleted) yield return null;

        ParseObject obj = queryTask.Result;

        ParseFile pfile = obj.Get<ParseFile>("file");
        Debug.Log(pfile.Url.AbsoluteUri);
        var imageRequest = new WWW(pfile.Url.AbsoluteUri);
        yield return imageRequest;
        Debug.Log("imageRequest " + imageRequest.text);
    }

}