c# 下载视频文件

 private void DownLoad_Video()
        {
            string pathUrl = "";
            System.Net.HttpWebRequest request = null;
            System.Net.HttpWebResponse response = null;
            //请求网络路径地址
            request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(pathUrl);
            request.Timeout = 5000; // 超时时间
                                    //获得请求结果
            response = (System.Net.HttpWebResponse)request.GetResponse();
            //文件下载地址
            string path = System.IO.Directory.GetCurrentDirectory() + @"\temp";
            
            // 如果不存在就创建file文件夹
            if (!Directory.Exists(path))
            {
                if (path != null) Directory.CreateDirectory(path);
            }
            path = path + "/自己想要的名字.mp4";
            Stream stream = response.GetResponseStream();
            //先创建文件
            Stream sos = new System.IO.FileStream(path, System.IO.FileMode.Create);
            byte[] img = new byte[1024];
            int total = stream.Read(img, 0, img.Length);
            while (total > 0)
            {
                //之后再输出内容
                sos.Write(img, 0, total);
                total = stream.Read(img, 0, img.Length);
            }
            stream.Close();
            stream.Dispose();
            sos.Close();
            sos.Dispose();
        }