First you need to get a Google Translate API key from their website. There is a Getting Started guide here: https://developers.google.com/translate/v2/getting_started
static void Main(string[] args)
{
GoogleTranslate google = new GoogleTranslate("INSERT-YOUR-KEY-HERE");
List<Translation> results = google.Translate(Language.English, Language.German, "Hello there.", "How are you?", "Multiple texts are allowed!");
foreach (Translation translation in results)
{
Console.WriteLine(translation.TranslatedText);
}
Console.ReadLine();
}
For more examples, take a look at the GoogleTranslate.Examples and GoogleTranslate.Tests projects.