How do I Handle Business Logic Exceptions?

How du I access Session in the partiel method like  OnValidate? I want to set a field to a session-variable on every insert.

if (action == System.Data.Linq.ChangeAction.Insert)

{

  Id = Guid.NewGuid();

  AccountId = Session("AccontId"); // Current account

}

You would need to use HttpContext.Current.Session, but I think you'd be tying your model objects to the Session which could limit your design's usefulness in other projects.

You'd need to use HttpContext.Current.Session.

Hi Scott. How can I implement business logic in the Delete-Insert-Update/Object partial method in the DataContext partial class? Thanks in advance.

Thanks for all your work on these videos!

Scott first off thank you very much for the videos! I am starting to understand the power of Dynamic data.

One question that throws red alerts in my mind is using exceptions for validation. Is there way to tie in a more simple validation like in Rocky Lhotka CSLA framework of having a collection of validation errors instead of throwing a expensive (time and cpu) exception?

Thanks!

I created a partial class Product and implemented OnProductNameChanging just like Scott in the video. It fires 3 times with new value, old value and then again new value of the product? Therefore throwing ValidationException the second  time it fires with the value Chai instaed of ACME.

I got the same as above any solution/how to check which value we are using.

Thanks for the great tutorials.

Thanks! Jërëjëf!

When I try to validate some value and throw exception let's say in OnContentIDChanging(int? value) method I will recieve JavaScript error (exception) instead of "validation summary" error. I'm experiencing this problem only with nullable types. Any idea where is the problem or how to solve this?

Thanks in advance!

well done

thanks for the validation presentation, but if I want to apply my validation in just one page for e.g. let us say Insert and not in Update. where do i have to write it ?