Asynchronous downloading in C# [modified]

[Lost User]

In C#, is there a simple way to resume an download over http, transparantly? For example, i call a function to download a file x to drive c:. In the middle of the operation, I close the downloading program. The program would abort the transfer, but not delete the partially downladed file x. I start the program, and once again call the function to download the same file x to driver c:. The function would realize that there is already a part of file x present on drive c: and then resume the download. Can any one help me??? Thanking U, Sunil G.

modified on Saturday, May 1, 2010 4:38 AM

[Abhinav S]

Use the DownloadDataAsync method of the WebClient class to download files from a server.

[Lost User]

Using WebClient you can download your file synchronously as well as asynchronously. Download File Synchronously

using System.Net;

WebClient webClient = new WebClient();
webClient.DownloadFile("http://mysite.com/myfile.txt", @"c:\myfile.txt");

Download File Asynchronously

private void btnDownload_Click(object sender, EventArgs e)
{
WebClient webClient = new WebClient();
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
webClient.DownloadFileAsync(new Uri("http://mysite.com/myfile.txt"), @"c:\myfile.txt");
}

private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
progressBar.Value = e.ProgressPercentage;
}

private void Completed(object sender, AsyncCompletedEventArgs e)
{
MessageBox.Show("Download completed!");
}

Hope this will help!

Jinal Desai - LIVE

[Lost User]

Madam I think u didnt get my point. For example, I call a function to download a file x to drive c:. In the middle of the operation, I close the downloading program. The program would abort the transfer, but not delete the partially downladed file x. I start the program, and once again call the function to download the same file x to driver c:. The function would realize that there is already a part of file x present on drive c: and then resume the download. Thanking You, Sunil G.

[RaviBee]

The HttpWebRequest.AddRange()[^] method allows you to resume downloading from a specific point. /ravi

My new year resolution: 2048 x 1536 Home | Articles | My .NET bits | Freeware ravib(at)ravib(dot)com

[Lost User]

So if you want resuming download then try following link. http://www.devx.com/dotnet/Article/22533[^]

Jinal Desai - LIVE

modified on Monday, May 3, 2010 5:37 AM

[Abdul Rahman Hamidy]

I would recommend using Socket Class which provides you to resume, stop your downloading or Uploading.

Abdul Rahaman Hamidy Database Developer Kabul, Afghanistan