.net - Error on editing data to save in database -


i doing record keeping system , used data source instead of coding whole connection, add. edit, delete, search. searched every videos , tutorials , saw add, save, delete, move next, move previous. etc. no edit. followed them. data saved, , can deleted. whenever try edit data click save, says: concurrency violation: updatecommand affected 0 expected 1 records. made sure database data source of gridview , of textboxes connected each respective data/field. missing something?


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