Example.cs

// Domain
interface IUsersRepository
{
	IEnumerable<User> FindAll(int pageIndex, int pageSize);
}

class User
{
	public int Id { get; private set; }

	public string Username { get; private set; }
}

// Web
class UsersController : System.Web.Mvc.Controller
{
	private readonly IUsersRepository _usersRepository;

	public UsersController(IUsersRepository usersRepository)
	{
		_usersRepository = usersRepository;
	}

	public ActionResult Index(int pageIndex)
	{
		var users = _usersRepository.FindAll(pageIndex, 100);
	}
}

// Infrastructure
class MongoDbUsersRepository : IUsersRepository
{
	private readonly MongoDatabase _database;

	public MongoDbUsersRepository(string connectionString)
	{
		var url = new MongoUrl(connectionString);
		var client = new MongoClient(url);
		var server = client.GetServer();
		var database = server.GetDatabase(url.DatabaseName);

		_database = database;
	}

	public IEnumerable<User> FindAll(int pageIndex, int pageSize)
	{
		var collection = _database.GetCollection<User>("Users");

		var users = collection.FindAll().SetSortOrder("Username").SetSkip((pageIndex - 1) * pageSize).SetLimit(pageSize).ToList();

		return users;
	}
}