Download large file from FTP C#

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C#

I am trying to download a file via FTP using sample code I found as my old code doesn't work with larger files due to it grabbing the whole file at once which causes Out of Memory errors.

The reader.read() is asking for (char[],int,int) i'm feeding it (byte[],int,int) like normal Read() methods I have used in the past.

Is it asking for char[] because it's a response stream? and How do I even create a char[] buffer that is simular to the byte[] I have used previously?

Am I even on the right track?

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp01/temp.exe");
            request.Method = WebRequestMethods.Ftp.DownloadFile;

            request.Credentials = new NetworkCredential("admin", "1234");

            FtpWebResponse response = (FtpWebResponse)request.GetResponse();

            Stream responseStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(responseStream);
            FileStream file = File.Create(@"c:\temp\temp.exe");
            byte[] buffer = new byte[32 * 1024];
            int read;
            reader.Read(
            while ((read = reader.Read(buffer,0,buffer.Length)) > 0)
            {
                file.Write(buffer, 0, read);
            }
            file.Close();
            reader.Close();
            response.Close();

Thanks in advance for any help.