gistfile1.cs

using System;
using System.Diagnostics;
using System.Threading;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            new Thread(() => { new Downloader().Exceute(); }).Start();
            new Thread(() => { new Downloader().Exceute(); }).Start();

            Console.ReadLine();
        }
    }

    class Downloader
    {
        private long filename = DateTime.Now.Ticks;

        public void Exceute()
        {
            var p = new Process();
            p.StartInfo.FileName = @"D:\curl.exe";
            p.StartInfo.Arguments = string.Format("-o D:\\{0}.exe http://dldir1.qq.com/qqfile/qqvideo/QQVideoDesktop1.0final.exe", filename);
            p.StartInfo.CreateNoWindow = true;
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardError = true;
            p.ErrorDataReceived += p_ErrorDataReceived;
            p.Start();
            p.BeginErrorReadLine();
            p.WaitForExit();
        }

        void p_ErrorDataReceived(object sender, DataReceivedEventArgs e)
        {
            string data = e.Data;
            if (e.Data != null && !data.Contains("Total"))
            {
                var source = data.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
                if (source.Length > 0)
                    Console.WriteLine("{3}\t{0}%\t{1}/{2}", source[0], source[3], source[1], filename);
            }
        }
    }
}