gistfile1.cs

    public interface IPaginatorModel<TEntity> where TEntity : Entity
    {
	ICollection<TEntity> GetPage(int pageSize, 
				int pageNumber, 
				Expression<Func<TEntity, bool>> filterFunction, 
				Func<TEntity, object> sortFunction);
				
        int GetPageCount(int pageSize, 
			Expression<Func<TEntity, bool>> filterFunction);


    }

//The implementation:

[PersistenceConversational(MethodsIncludeMode = MethodsIncludeMode.Implicit)]
public class PaginatorModel<TEntidad> : IPaginatorModel<TEntidad> where TEntidad : Entity
{
	private readonly IDaoReadOnly<TEntidad> _dao;

	public ModeloListar(IDaoFactory daoFactory)
	{
		_dao = daoFactory.GetDaoReadOnlyOf<TEntidad>();
	}

	#region IPaginatorModel<TEntidad> Members

	[PersistenceConversation(ConversationEndMode = EndMode.End)]
    public virtual ICollection<TEntidad> GetPage(
        int pageSize, int pageNumber,
        Expression<Func<TEntidad, bool>> filterFunction,
        Func<TEntidad, object> sortFunction)
    {
        return _dao
            .Retrieve(predicado)
            .OrderBy(sortFunction)
            .Skip(pageSize * pageNumber)
            .Take(pageSize).ToList();
    }

	[PersistenceConversation(ConversationEndMode = EndMode.End)]
	public virtual int GetPageSize(
		int pageSize,
		Expression<Func<TEntidad, bool>> filterFunction)
	{
		//balbalblalbal
	}

	#endregion
}