Article: http://www.zzzprojects.com/entity-framework-extensions/docs/api/options-audit

entity-framework-extensions-docs-api-options-audit-example-1.cs

List<AuditEntry> auditEntries = new List<AuditEntry>();
using (var ctx = new EntitiesContext())
{
    ctx.BulkSaveChanges(list, operation =>
    {
        operation.UseAudit = true;
        operation.BulkOperationExecuted = bulkOperation => auditEntries.AddRange(bulkOperation.AuditEntries);
    });
}

foreach (var entry in auditEntries)
{
    foreach (var value in entry.Values)
    {
        var oldValue = value.OldValue;
        var newValue = value.NewValue;
    }
}