public virtual Net.Vpc.Upa.Impl.Uql.Compiledexpression.CompiledSelect OrderBy(int position, Net.Vpc.Upa.Impl.Uql.Compiledexpression.DefaultCompiledExpression field, bool isAscending) { Invalidate(); order.InsertOrder(position, field, isAscending); PrepareChildren(field); return(this); }