void Upload(string filename)
        {
            try
            {
                Uri adress = new Uri("ftp://ftp.wsiz.rzeszow.pl/w53850");
                string path1 = Path.Combine(Path.GetDirectoryName(Application.ExecutablePath), "km2.xml");
                WebClient client = new WebClient();
                client.Credentials = new NetworkCredential(username, password);
                client.BaseAddress = "ftp://ftp.wsiz.rzeszow.pl/";
                client.UploadFile(filename,WebRequestMethods.Ftp.UploadFile, path1);

            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message);
            }
        }