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using (FileStream myFTPFileStream = new FileStream(transferFile, FileMode.Open))
{
    FtpWebRequest ftp = WebRequest.Create(FTPSettings.Host + @"/" + FTPSettings.Directory + "/" + fileName) as FtpWebRequest;
    ftp.Method = WebRequestMethods.Ftp.UploadFile;
    ftp.Credentials = new NetworkCredential(FTPSettings.User, FTPSettings.PW);
    ftp.Timeout = 10000;
    
    FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
    response.Close();
   
    Stream requestStream = ftp.GetRequestStream();

    const Int16 bufferLenght = 2048;
    Byte[] buffer = new Byte[bufferLenght];

    Int32 readBytes = myFTPFileStream.Read(buffer, 0, bufferLenght);

    do
    {
        readBytes = myFTPFileStream.Read(buffer, 0, bufferLenght);
        requestStream.Write(buffer, 0, bufferLenght);

    } while (readBytes != 0);

    requestStream.Close();
    myFTPFileStream.Close();
}					

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const Int16 bufferLenght = 1024;//Buffer größe
Int64 buffers = Convert.ToInt64(myFTPFileStream.Length / bufferLenght); //Anzahl der Buffers
Int32 lastBuffer = Convert.ToInt32(myFTPFileStream.Length - (buffers * bufferLenght));//Der Rest

Byte[] buffer = new Byte[bufferLenght];

for (Int32 i = 0; i < buffers; i++)
{
    myFTPFileStream.Read(buffer, 0, buffer.Length);
    requestStream.Write(buffer, 0, buffer.Length);
}
if (lastBuffer > 0)
{
    myFTPFileStream.Read(buffer, 0, lastBuffer);
    requestStream.Write(buffer, 0, lastBuffer);
}					

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    Byte[] buffer = new Byte[bufferLenght];

    int readBytes;

    do
    {
        readBytes = myFTPFileStream.Read(buffer, 0, bufferLenght);
        requestStream.Write(buffer, 0, readBytes);

    } while (readBytes != 0);