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Entity Framework 4 Custom Logic Saving Changes
ObjectSet = context.CreateObjectSet<TEntity>();

BusinessEntities.Person person = new BusinessEntities.Person()
        {
            TitleRef = 123,
            FirstName = "FirstName",
            Surname = "Surname",
            PhoneNumber = "PhoneNumber",
            MobileNumber = "MobileNumber",
            EmailAddress = "EmailAddress",
        };


ObjectSet.AddObject(entity);

Context.SaveChanges();

PersonAddress personAddress = new BusinessEntities.PersonAddress
        {
            StartDate = DateTime.Now,
            EndDate = DateTime.Now,
            OtherResidents = "OtherResidents",
            CurrentAddress = true,
            Address = new Address
            {
                Address1 = "Address1",
                Address2 = "Address2",
                Address3 = "Address3"
            }
        };

Context.SaveChanges();


    public override int SaveChanges(SaveOptions options)
    {
        foreach (ObjectStateEntry entry in
            ObjectStateManager.GetObjectStateEntries(
            EntityState.Added | EntityState.Modified))
        {
            System.Collections.ObjectModel.ReadOnlyCollection<FieldMetadata> fieldsMetaData = entry.CurrentValues
                                  .DataRecordInfo.FieldMetadata;

            FieldMetadata createdField = fieldsMetaData
            .Where(f => f.FieldType.Name == "CreatedBy").FirstOrDefault();

            FieldMetadata modifiedField = fieldsMetaData
            .Where(f => f.FieldType.Name == "LastUpdatedBy").FirstOrDefault();

            if (modifiedField.FieldType != null)
            {
                string fieldTypeName = modifiedField.FieldType.TypeUsage.EdmType.Name;
                if (fieldTypeName == PrimitiveTypeKind.String.ToString())
                {
                    if (entry.CurrentValues[createdField.Ordinal].ToString() == null ||
                       entry.CurrentValues[createdField.Ordinal].ToString() == String.Empty)
                    {
                        entry.CurrentValues.SetString(createdField.Ordinal, CustomRepository.CurrentUser);
                    }

                    entry.CurrentValues.SetString(modifiedField.Ordinal, CustomRepository.CurrentUser);
                }
            }
        }
        return base.SaveChanges(options);
    }

private void Initialize()
    {
        // Creating proxies requires the use of the ProxyDataContractResolver and
        // may allow lazy loading which can expand the loaded graph during serialization.
        ContextOptions.ProxyCreationEnabled = false;
        ObjectMaterialized += new ObjectMaterializedEventHandler(HandleObjectMaterialized);

        OnContextCreated();
    }

    private void OnContextCreated()
    {
        this.SavingChanges += Context_SavingChanges;
    }

IEnumerable<ObjectStateEntry> objectStateEntries =
            from ose
            in this.ObjectStateManager.GetObjectStateEntries(EntityState.Added
                                                                | EntityState.Modified)
            where ose.Entity != null
            select ose;

            foreach (ObjectStateEntry entry in objectStateEntries)
            {
                System.Collections.ObjectModel.ReadOnlyCollection<FieldMetadata> fieldsMetaData = entry.CurrentValues
                    .DataRecordInfo.FieldMetadata;

                FieldMetadata createdField = fieldsMetaData
                .Where(f => f.FieldType.Name == "CreatedBy").FirstOrDefault();

                FieldMetadata modifiedField = fieldsMetaData
                .Where(f => f.FieldType.Name == "LastUpdatedBy").FirstOrDefault();

                if (modifiedField.FieldType != null)
                {
                    string fieldTypeName = modifiedField.FieldType.TypeUsage.EdmType.Name;
                    if (fieldTypeName == PrimitiveTypeKind.String.ToString())
                    {
                        if (entry.CurrentValues[createdField.Ordinal].ToString() == null ||
                           entry.CurrentValues[createdField.Ordinal].ToString() == String.Empty)
                        {
                            entry.CurrentValues.SetString(createdField.Ordinal, CustomRepository.CurrentUser);
                        }

                        entry.CurrentValues.SetString(modifiedField.Ordinal, CustomRepository.CurrentUser);
                    }
                }
            }