public static DbSelectExpression RemoveOrderExpression(this DbSelectExpression select, DbOrderExpression ordering)
 {
     if (select.OrderBy != null && select.OrderBy.Count > 0)
     {
         List <DbOrderExpression> orderby = new List <DbOrderExpression>(select.OrderBy);
         orderby.Remove(ordering);
         return(select.SetOrderBy(orderby));
     }
     return(select);
 }
        public static DbSelectExpression AddOrderExpression(this DbSelectExpression select, DbOrderExpression ordering)
        {
            List <DbOrderExpression> orderby = new List <DbOrderExpression>();

            if (select.OrderBy != null)
            {
                orderby.AddRange(select.OrderBy);
            }
            orderby.Add(ordering);
            return(select.SetOrderBy(orderby));
        }