I have a simple WinForms test application in C#. Using the following method, I'm able to upload a file when I invoke the method from my button's Click event handler. The only problem is: my Windows Form "freezes". I can't close it using the Close button. I have to end execution from within the IDE (Visual C# 2010 Express edition). Here are the two methods:

    public void UploadFile(string FullPathFilename) {
        string filename = Path.GetFileName(FullPathFilename);

        try {

            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(_remoteHost + filename);
            request.Method = WebRequestMethods.Ftp.UploadFile;
            request.Credentials = new NetworkCredential(_remoteUser, _remotePass);

            StreamReader sourceStream = new StreamReader(FullPathFilename);
            byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());

            request.ContentLength = fileContents.Length;

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

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

            response.Close();
            requestStream.Close();
            sourceStream.Close();

        }
        catch (Exception ex) {                
            MessageBox.Show(ex.Message, "Upload error");
        }
        finally {

        }

    }

which gets called here:

    private void btnUploadTxtFile_Click(object sender, EventArgs e) {

        string username = "my_username";
        string password = "my_password";
        string host = "ftp://mywebsite.com";

        try {
            clsFTPclient client = new clsFTPclient(host + "/httpdocs/non_church/", username, password);
            client.UploadFile(Path.GetDirectoryName(Application.ExecutablePath) + "\\myTextFile.txt");
        }
        catch (Exception ex) {
            MessageBox.Show(ex.Message, "Upload problem");
        }
    }