Bonnie,
First, thank you for your message.
Do I understand correctly that when you check for duplicate ID code in a method of a textbox, you don't do it right there (in the method of a UI tier)? But instead you call some method of a BIZ tier than that method calls a method of a DA tier?
>Dmitry,
>
>In my app, when I have an requirement for a unique ID that the user must enter, I query the database in the Validating event of the ID's TextBox to see if it already exists and notify the user right then.
>
>~~Bonnie
>
>
>
>>>Maybe you shouildn't allow the error to happen in the first place?
>>>
>>
>>It is an error exactly. I can't prevent a user from entering a duplicate value in an ID field. The only way (as far as I know) to trap it is when UPDATE SQL is sent to SQL Server to see what is returned. So I need to inform the user that this entry has been already assigned to another record/row. If you know of a better way to do it, instead of using SQL Server to return an error, please let me know.
>>
>>UPDATE: I meant to say, "it is NOT an error exactly"
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