public TEntity GetSingleOrderByDescending(Expression <Func <TEntity, TKey> > keySelector,
Expression <Func <TEntity, bool> > predicate)
{
var queryCriteria = new ExpressionQuery <TEntity>();
queryCriteria.OrderByDescending(keySelector);
if (predicate != null)
{
queryCriteria.And(predicate);
}
var find = queryCriteria.Execute(Set);
return(find.FirstOrDefault());
}