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string FileName = "xxxx.xlsx";
Uri uri = new Uri(Application.Current.Host.Source, "../DownLoad.ashx?filename=" + FileName);
WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
client.OpenReadAsync(uri);
void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{}