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Well, it turns out that my approach of returning an envelope just wasn’t cutting it.
What I had to do was throw an exception from the BLL class back to the calling page so that the Form View’s Item Inserted and Item Updated events would keep the old data around. If it doesn’t see an exception, it thinks that the operation before (insert or update) was successful and it doesn’t keep the old data around.
Admittedly I hardly ever use binding and Data Sources.
I generally prefer custom objects and manually setting and getting data.
Everything worked fine using this approach except for retaining the values in the Form View that the user had changed before the last insert or update action.
I couldn’t for the life of me figure out why the Form View kept re-initializing the data even though I didn’t actually save anything to the DB in the BLL.
Here are the steps: The last steps require that you bind the Data Text Field and Data Value Field properties to the Customer IDData Source and the Selected Value to the original source's Customer ID.
The Drop Down List should be configured to look like the ASP. The Data Source ID for the Drop Down List points at Customer IDData Source.
Bind reads and writes and Eval only reads from the Data Source.Before I go into what I needed to do to fix it, I’ll give a little bit of background. The Object Data Source maps to our business logic layer for the Select, Insert and Update methods.Initially, the insert and update methods were returning an “envelope” object that contained a list of any BLL errors that were caught from server-side validation.To demonstrate data binding for a Drop Down List in a Form View switch the Form View to the Edit Item Template.You can use the Smart tags menu or switch to the ASP.