public async Task FileDownloadDB(string dropboxpath, string Zielpath, DropNetClient client)
        {
            //client = new DropNetClient(apiKey, appSecret, GetUserLoginDB(tokendb), GetUserLoginDB(secretdb));

            //NORMALEASYNCDOWNLOAD
            /*
            try
            {
                client.GetFileAsync(dropboxpath,
                    (response) =>
                    {
                        MessageBox.Show("DO");

                        using (FileStream fs = new FileStream(Zielpath, FileMode.Create))
                        {
                            for (int i = 0; i < response.RawBytes.Length; i++)
                            {
                                fs.WriteByte(response.RawBytes[i]);
                            }
                        }
                    },
                    (error) =>
                    {
                        MessageBox.Show("error downloading");
                    });
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }*/

            //TASK DOWNLOAD

            try
            {
                using (FileStream fs = new FileStream(Zielpath, FileMode.Create))
                {
                    RestSharp.IRestResponse ir = await client.GetFileTask(dropboxpath) as RestSharp.IRestResponse;

                    for (int i = 0; i < ir.RawBytes.Length; i++)
                    {
                        fs.WriteByte(ir.RawBytes[i]);
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }