Send large file to WCF service and vise versa

WCFClient.ServiceReference1.FileTransferServiceClient client=
                new WCFClient.ServiceReference1.FileTransferServiceClient();
            string uploadfilename = "Upload.txt";

            using (FileStream fs = new FileStream(@"C:\"+uploadfilename, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                client.UploadFile(uploadfilename, fs); <font color="red">// There is I have an error!!!</font>
            }

[ServiceContract]
    public interface IFileTransferService
    {
        [OperationContract(IsOneWay = true)]
        void UploadFile(FileUploadMessage request);
        [OperationContract(IsOneWay = false)]
        FileDownloadReturnMessage DownloadFile(FileDownloadMessage request);
    }

    [MessageContract]
    public class FileUploadMessage
    {
        [MessageHeader(MustUnderstand = true)]
        public string Filename;
        [MessageBodyMember(Order = 1)]
        public Stream FileByteStream;
    }

    [MessageContract]
    public class FileDownloadMessage
    {
        [MessageHeader(MustUnderstand = true)]
        public string Filename;
    }

    [MessageContract]
    public class FileDownloadReturnMessage
    {
        public FileDownloadReturnMessage(string filename, Stream stream)
        {
            this.DownloadedFilename = filename;
            this.FileByteStream = stream;
        }

        [MessageHeader(MustUnderstand = true)]
        public string DownloadedFilename;
        [MessageBodyMember(Order = 1)]
        public Stream FileByteStream;
    }

public class ServiceClass : IFileTransferServiceMarco
    {
public void UploadFile(FileUploadMessage request)
        {
            //try
            {
                string basePath = @"C:\Downloads";
                string serverFileName = Path.Combine(basePath, request.Filename);

                using (FileStream outfile = new FileStream(serverFileName, FileMode.Create))
                {
                    const int bufferSize = 65536; // 64K

                    Byte[] buffer = new Byte[bufferSize];
                    int bytesRead = request.FileByteStream.Read(buffer, 0, bufferSize);

                    while (bytesRead > 0)
                    {
                        outfile.Write(buffer, 0, bytesRead);
                        bytesRead = request.FileByteStream.Read(buffer, 0, bufferSize);
                    }
                }
            }
           // catch (IOException e)
            {
            //    throw new FaultException<ioexception>(e);
            }
        }

        public FileDownloadReturnMessage DownloadFile(FileDownloadMessage request)
        {
            string localFileName = request.Filename;
            try
            {
                string basePath = @"C:\Downloads";
                string serverFileName = Path.Combine(basePath, request.Filename);

                Stream fs = new FileStream(serverFileName, FileMode.Open);

                return new FileDownloadReturnMessage(request.Filename, fs);
            }
            catch (IOException e)
            {
                throw new FaultException<ioexception>(e);
            }            
        }
}</ioexception></ioexception>

endpoint address="winceStream"
	                  binding="basicHttpBinding"
	                  bindingConfiguration="HttpBinding_MTOM"
	                  contract="EssentialWCF.IFileTransferService" 
....
bindings
      basicHttpBinding
        binding name="HttpBinding_MTOM" messageEncoding="Mtom" transferMode="Streamed" maxReceivedMessageSize="4294967294">
          
        binding
      basicHttpBinding       
    bindings