string filePath = @"E:\WorkStudio\ntaste\ntaste.Test\datafile\item.csv";
var model = new FileDataModel(filePath);
var similarity = new PearsonCorrelationSimilarity(model);
var neighborhood = new NearestNUserNeighborhood(4, similarity, model);
var recommender = new GenericUserBasedRecommender(model, neighborhood, similarity);
var iter = model.getUserIDs();
while (iter.MoveNext())
{
    var userId = iter.Current;
    var recommendedItems = recommender.recommend(userId, 5);
    Console.Write("uid:" + userId);
    foreach (var ritem in recommendedItems)
    {
        Console.Write("(" + ritem.getItemID() + "," + ritem.getValue() + ")");
    }
    Console.WriteLine();
}