var c = new BayesSimpleTextClassifier();

c.Train("spam", "Buy now some pills. You'll receive a free prize");
c.Train("not spam", "Hello my friend, I miss you. I want to meet you soon.");

var result = c.Classify("Hi my friend, I want to buy a gift for you");
foreach(var item in result)
{
    Console.WriteLine(item.Key + ": " + item.Value);
}