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What is a DbUpdateConcurrencyException exception in EF Core?
<p>In EF Core, a <code>DbUpdateConcurrencyException</code> is thrown when there's a conflict while trying to save changes to the database.</p> <p>For example, let's say the current customer name is <code>Joathan</code>, but you want to fix the name and update it to <code>Jonathan</code>; meanwhile, already someone else has updated it to <code>Mikael</code>. A <code>DbUpdateConcurrencyException</code> must be manually solved to know if we should keep the new database value or overwrite it.</p>
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