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Thank you for replying, jmcilhinney. Actually, I designed the db, too. You can lock records on SQL during a transaction but for the problem described here, there may be no SQL transaction actually executing during the time period when another user tries to email the record. The first user may...

I have a VB.net windows app that's been in production a few years. There's a main page with a datagrid showing rows of items. The user can click on an row to display another page with the selected item's detail. Recently 2 users displayed the same row concurrently; the first user clicked on a...