Dowloading file using webclient

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Dear All,

I am trying to download zip files from a webaddress. For that I am using webclient concept. When I download the file for the first time it works fine. But for the next time the file downloaded was with 0KB. Where I am going wrong please help ASAP.

For your information, I hereby provided few lines for your reference.

VB

_WC = New System.Net.WebClient
            If System.IO.Directory.Exists(fDownloads) Then
                If System.IO.File.Exists(fDownloads & "\" & cellval) Then
                    System.IO.File.Delete(fDownloads & "\" & cellval)
                    _WC.DownloadFileAsync(New Uri(strWebAddress & "/itrol/" & cellval), fDownloads & "\" & cellval, cellval)
                    System.Threading.Thread.Sleep(1500)
                Else
                    '_WC.DownloadFileAsync((strWebAddress & "/itrol/" & cellval), fDownloads & "\" & cellval, cellval)
                    _WC.DownloadFileAsync(New Uri(strWebAddress & "/itrol/" & cellval), fDownloads & "\" & cellval, cellval)
                    System.Threading.Thread.Sleep(1500)
                End If
            Else
                System.IO.Directory.CreateDirectory(fDownloads)
                _WC.DownloadFileAsync(New Uri(strWebAddress & "/itrol/" & cellval), fDownloads & "\" & cellval, cellval)
                System.Threading.Thread.Sleep(1500)
            End If


 _WC.CachePolicy = New System.Net.Cache.RequestCachePolicy(System.Net.Cache.RequestCacheLevel.NoCacheNoStore)
                    _WC.CancelAsync()
                    _WC.Dispose()
                    _WC = Nothing

Posted 13-Feb-14 0:36am

rahulaaditya

Updated 13-Feb-14 0:40am

Vedat Ozan Oner

v2

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Vedat Ozan Oner · Accepted Answer · 2014-02-13T00:50:00

If you start file download async, then you should handle DownloadFileCompleted event. async download means that you want to do the task in another thread, not to wait for it to complete. therefore you have to handle this event to progress on that job further when it finished. thread sleep doesn't guarantee that your download will finish in that sleep time, as in your case.

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;

namespace Test_WebClient
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                WebClient cl = new WebClient();
                // handle event
                cl.DownloadFileCompleted += cl_DownloadFileCompleted;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        }

        static void cl_DownloadFileCompleted(object sender,
            System.ComponentModel.AsyncCompletedEventArgs e)
        {
            // do your job
        }
    }
}