Ftp Problem

Guy's I'm trying to use an example below to FTP a file to my web server but it doesn't seem to work, is there anything obvious that I'm missing on the below? (obviously I've coded out my credentials on the below example):

try
            {
                // Get the object used to communicate with the server.
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.server.co.uk/");
            request.Method = WebRequestMethods.Ftp.UploadFile;

            // This example assumes the FTP site uses anonymous logon.
            request.Credentials = new NetworkCredential ("username","password");
           
            // Copy the contents of the file to the request stream.
            StreamReader sourceStream = new StreamReader(@"c:\test\testfile.txt");
            byte [] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
            sourceStream.Close();
            request.ContentLength = fileContents.Length;

            Stream requestStream = request.GetRequestStream();
            requestStream.Write(fileContents, 0, fileContents.Length);
            requestStream.Close();
           
            FtpWebResponse response = (FtpWebResponse)request.GetResponse();

            response.Close();
            MessageBox.Show("File Uploaded");
            }
            catch
            {
                MessageBox.Show("Something went wrong!");
            }