How to achieve pause and resume download using webclient?

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C#

FileStream

WebClient

I am developing a windows application which downloads multiple files. The application has to process\execute those files in the background after each file downloaded. So I have used the background worker to perform the download action and execute the downloaded file. Download and file execution is working fine till having a proper network connection. If there is any connection problem, then download skipped to the next file.

But I want to pause the download for a while (2,3 minutes) and resume it after reconnecting the network. In the meantime, file execution process should be performed in the background.

What I have tried:

Using webclient (below code), I am performing the download action.

using (WebClient client)
{
try
{
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged(applicationName));
client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted(fileSize, applicationName));
await AsyncPlatformExtensions.DownloadFileTaskAsync(client, new Uri(sourceUri), outputDir);
}
catch (WebException exe)
{
}       
}