The Custom Bootstrapper from my first Nancy FX app.

CustomBootstrapper.cs

public class CustomBootstrapper : DefaultNancyBootstrapper
{
  protected override void ConfigureApplicationContainer(TinyIoCContainer container)
  {
    string mongoUser = ConfigurationManager.AppSettings["MongoUser"];
    string mongoPassword = ConfigurationManager.AppSettings["MongoPassword"];
    var connString = ConfigurationManager.AppSettings["MongoUrl"];
    connString = string.Format(connString, mongoUser, mongoPassword);
    var databaseName = connString.Split('/').Last();

    var client = new MongoClient(connString);
    var server = client.GetServer();

    var database = server.GetDatabase(databaseName);
    base.ConfigureApplicationContainer(container);

    if (!database.CollectionExists("Comments"))
        database.CreateCollection("Comments");

    container.Register<MongoServer>(server);
    container.Register<MongoDatabase>(database);
    container.Register<MongoCollection<Comment>>(database.GetCollection<Comment>("Comments"));
  }
}