Web.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace TensorFlowNET.Examples.Utility
{
    public class Web
    {
        public static bool Download(string url, string destDir, string destFileName)
        {
            if (destFileName == null)
                destFileName = url.Split(Path.DirectorySeparatorChar).Last();

            Directory.CreateDirectory(destDir);

            string relativeFilePath = Path.Combine(destDir, destFileName);

            if (File.Exists(relativeFilePath))
            {
                Console.WriteLine($"{relativeFilePath} already exists.");
                return false;
            }

            var wc = new WebClient();
            Console.WriteLine($"Downloading {relativeFilePath}");
            var download = Task.Run(() => wc.DownloadFile(url, relativeFilePath));
            while (!download.IsCompleted)
            {
                Thread.Sleep(1000);
                Console.Write(".");
            }
            Console.WriteLine("");
            Console.WriteLine($"Downloaded {relativeFilePath}");

            return true;
        }
    }
}