Carga de SFTP con SSH.Net

Agregar NuGet SSH.NET

private void UploadFileSFTP()

    {

        const string host = "sftpXX.sapsfXX.com";

        const string username = "XXXXXXX";

        const string password = "XXXXXXX";

        const string workingdirectory = "/incoming/Prueba";//RUTA CARPETA EN EL SERVIDOR

        string uploadfile;

        uploadfile = Server.MapPath("~/Anexos/" + "Pruba2.txt");//RUTA ARCHIVO EN CARPETA DE APPLICACION WEB

        using (var client = new SftpClient(host, 22, username, password))

        {

            client.Connect();        

            client.ChangeDirectory(workingdirectory);        

            var listDirectory = client.ListDirectory(workingdirectory);

            foreach (var fi in listDirectory)

            {

                Console.WriteLine(" - " + fi.Name);

            }

            using (var fileStream = new FileStream(uploadfile, FileMode.Open))

            {

                client.BufferSize = 4 * 1024; // bypass Payload error large files

                client.UploadFile(fileStream, Path.GetFileName(uploadfile));

            }

        }

    }

Estructura de carpeta Anexos en sitio web.