C# download big file

I had validated this.To download SSMS which is more than 500M+

 static void Main(string[] args)
        {
            string url = "https://go.microsoft.com/fwlink/?linkid=2108895&clcid=0x409";
            DownloadBigFile(new Uri(url), "ssms.exe");
        }

        static void DownloadBigFile(Uri url, string outputFilePath)
        {
            const int BUFFER_SIZE =  * ;
            using (var outputFileStream = File.Create(outputFilePath, BUFFER_SIZE))
            {
                var req = WebRequest.Create(url);
                using (var response = req.GetResponse())
                {
                    using (var responseStream = response.GetResponseStream())
                    {
                        var buffer = new byte[BUFFER_SIZE];
                        int bytesRead;
                        do
                        {
                            bytesRead = responseStream.Read(buffer, , BUFFER_SIZE);
                            outputFileStream.Write(buffer, , bytesRead);
                        } while (bytesRead > );
                    }
                }
            }
        }