SSH.NET Upload whole folder

There's no magical way. You have to enumerate the files and upload them one-by-one:

void UploadDirectory(SftpClient client, string localPath, string remotePath)
{
    Console.WriteLine("Uploading directory {0} to {1}", localPath, remotePath);

    IEnumerable<FileSystemInfo> infos =
        new DirectoryInfo(localPath).EnumerateFileSystemInfos();
    foreach (FileSystemInfo info in infos)
    {
        if (info.Attributes.HasFlag(FileAttributes.Directory))
        {
            string subPath = remotePath + "/" + info.Name;
            if (!client.Exists(subPath))
            {
                client.CreateDirectory(subPath);
            }
            UploadDirectory(client, info.FullName, remotePath + "/" + info.Name);
        }
        else
        {
            using (var fileStream = new FileStream(info.FullName, FileMode.Open))
            {
                Console.WriteLine(
                    "Uploading {0} ({1:N0} bytes)",
                    info.FullName, ((FileInfo)info).Length);

                client.UploadFile(fileStream, remotePath + "/" + info.Name);
            }
        }
    }
}

---

If you want a simpler code, you will have to use another library. For example my WinSCP .NET assembly can upload whole directory using a single call to Session.PutFilesToDirectory:

var results = session.PutFilesToDirectory(localPath, remotePath);
results.Check();