Download file with WebClient or HttpClient?

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You can do it natively with .Net 4.5+. I tried doing it your way and then I just found a method in Intellisense that seemed to make sense.

https://learn.microsoft.com/en-us/dotnet/api/system.io.stream.copytoasync?view=netframework-4.7.2

uri = new Uri(generatePdfsRetrieveUrl + pdfGuid + ".pdf");
HttpClient client = new HttpClient();
var response = await client.GetAsync(uri);
using (var fs = new FileStream(
    HostingEnvironment.MapPath(string.Format("~/Downloads/{0}.pdf", pdfGuid)), 
    FileMode.CreateNew))
{
    await response.Content.CopyToAsync(fs);
}

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