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For example, imagine that two users, Jisun and Sam, were both visiting a page in our application that allowed visitors to update and delete the products through a Grid View control.
In the first screen, we're prompted to specify the database to connect to - connect to the same Northwind database using the .
For web applications that allow multiple users to update or delete data, however, there's the potential for one user's modifications to clash with another concurrent user's.
Without any concurrency policy in place, when two users are simultaneously editing a single record, the user who commits her changes last will override the changes made by the first.
A few seconds after Jisun's changes have been committed, Sam updates the category to Condiments and clicks Update.
This results in an to the corresponding Beverages category ID, and so on.