Why is the program not responding while downloading using the WebClient method?

Question

C++ / C#

There is a program, like an updater, the meaning is very simple: the program downloads an archive with files and subsequently unzips it into a designated folder. But why does the program not respond when downloading an archive, but hangs after the download is completed?

string remoteUri = "http://example.xyz/up/";
            string fileName = "new.zip", myStringWebResource = null;
            // Create a new WebClient instance.
            WebClient myWebClient = new WebClient();
            myWebClient.DownloadProgressChanged += (s, e) =>
            {
                progressBar.Value = e.ProgressPercentage;
            };
            myWebClient.DownloadFileCompleted += (s, e) =>
            {
                progressBar.Visible = false;
            };

            // Concatenate the domain with the Web resource filename.
            myStringWebResource = remoteUri + fileName;
            // Download the Web resource and save it into the current filesystem folder.
            myWebClient.DownloadFile(myStringWebResource, fileName);
            Complete();
            string usr = SystemInformation.UserName;
            DirectoryInfo di = new DirectoryInfo(path);

            foreach (FileInfo file in di.GetFiles())
            {
                file.Delete();
            }
            foreach (DirectoryInfo dir in di.GetDirectories())
            {
                dir.Delete(true);
            }
            string zipPath = @"new.zip";
            string extractPath = @path;
            ZipFile.ExtractToDirectory(zipPath, extractPath);

            File.Delete("new.zip");

Answer 1

Obviously because you are calling the synchronous download method (DownloadFile), and it hangs the event loop until the download is complete. Have you tried downloading asynchronously?