How to Avoid DbUpdateConcurrencyException When Updating Records with Entity Framework 6?

How to Efficiently Update Records Using Entity Framework 6

When working with Entity Framework 6, updating records can sometimes result in the pesky "DbUpdateConcurrencyException" error. This issue arises when the entity's state has changed since it was originally loaded, leading to an unexpected number of rows affected by the update operation.

To resolve this error and ensure successful record updates, the following approach should be implemented:

1. Retrieve the Existing Record:

   Use the "SingleOrDefault" method to fetch the existing record based on a unique identifier, such as the "BookNumber" in this case.

2. Check for Existence:

   Ensure that the retrieved record is not null to avoid attempting an update on a nonexistent entity.

3. Modify the Record:

   Locate the property you wish to update and assign its new value directly to the retrieved record. Here, for example, "result.SomeValue = "Some new value";" would update the "SomeValue" property.

4. Save Changes:

   Call the "SaveChanges" method to persist the modified entity back to the database. This will update the record without encountering the "DbUpdateConcurrencyException" error.

5. Handle Exceptions (Optional):

   If desired, include an exception handling block to capture any potential errors during the save process.

By following these steps, you can efficiently update records using Entity Framework 6 and avoid the dreaded "DbUpdateConcurrencyException" error.

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