Uploading large files in using in a built in FTP client in c#

// I have this code below that does fine for uploading file from a server to another, but I am concerned if the client have a large file to FTP, I am looking for some code to implement the idea of buffering/streaming chunks of the file instead of FTPing the file in one shot, the line of code that I am thinking to change is "requestStream.Write(fileContents, 0, fileContents.Length);" This is where I need to loop through and send the file in chunks to FTP server, any ideas on how to do that?

FtpWebRequest request = null;
StreamReader sourceStream = null;
Stream requestStream = null;
FtpWebResponse response = null;

try
          {

// Get the object used to communicate with the server.

request = (FtpWebRequest)WebRequest.Create(@ftpServer + tmpFilename);
              request.Method = WebRequestMethods.Ftp.UploadFile;
              request.UsePassive = true;
              request.EnableSsl = true;

// This example assumes the FTP site uses anonymous logon.

request.Credentials = new NetworkCredential(ftpUser, connectionStringToFTP);

// Copy the contents of the file to the request stream.

sourceStream = new StreamReader(@fromSource + tmpFilename);
             byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
             request.ContentLength = fileContents.Length;

             requestStream = request.GetRequestStream();
             requestStream.Write(fileContents, 0, fileContents.Length);

             if (requestStream != null)
             {
                 requestStream.Flush();
                 requestStream.Close();
                 requestStream.Dispose();
             }

             response = (FtpWebResponse)request.GetResponse();
             bool ftpSuccessful = false;

               if (response.StatusDescription.StartsWith("226"))
               {
                   ftpSuccessful = true;
               }
               else
               {

//.....etc.

}
          }
catch(...)
{

//catch something required to be captured....etc.

}
finally
{

//close/dispose/flush streams here

}

Tags: C#, .NET, FTP