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Use the SqlRowsCopiedEventArgs.Abort property to cancel a bulk copy operation. Set SqlRowsCopiedEventArgs.Abort to true to abort the bulk copy operation.
If you call the Close method from SqlBulkCopy.SqlRowsCopied, an exception is generated, and the System.Data.SqlClient.SqlBulkCopy object state does not change.
If an application specifically creates a System.Data.SqlClient.SqlTransaction object in the System.Data.SqlClient.SqlCommand constructor, the transaction is not rolled back. The application is responsible for determining whether it is required to rollback the operation, and if so, it must call the SqlTransaction.Rollback method. If the application does not create a transaction, the internal transaction corresponding to the current batch is automatically rolled back. However, changes related to previous batches within the bulk copy operation are retained, because the transactions for them already have been committed.