public record Person
{
    public int Id { get; set; } // 4 bytes
    public DateTime Birthday { get; set; } // 8 bytes

    [BinaryStoreRecordLength(30)] // limit attribute for strings, arrays atc
    public string FirstName { get; set; }

    [BinaryStoreRecordLength(30)]
    public string LastName { get; set; }
}

BinaryStore<Person> binaryStore = new BinaryStore<Person>(stream);

binaryStore.Append(new Person()
{
    Id = 1,
    FirstName = "FirstName 1",
    LastName = "LastName 1",
    Birthday = new DateTime(2001, 1, 1)
});

binaryStore.Append(new Person()
{
    Id = 2,
    FirstName = "FirstName 2",
    LastName = "LastName 2",
    Birthday = new DateTime(2002, 2, 2)
});

Console.WriteLine("Records in store: " + binaryStore.GetRecordsCount());

for (int i = 0; i < binaryStore.GetRecordsCount(); i++)
{
    Console.WriteLine(i + " - " + binaryStore.Read(i));
}

private static object LockObject = new object();

//...

BinaryStore<Person> binaryStore = new BinaryStore<Person>(stream, LockObject);

BinaryStore<Person> binaryStore = new BinaryStore<Person>(stream, builder =>
{
    builder.BinaryAttributePropertiesOnly = true; // serialize only properties with [BinaryStoreRecord] attribute
    builder.SeekToBeginningAtStartup = true; // goto stream 0 at stratup 
    builder.Serializers.Add(new BinaryStoreByteArraySerializer()); // add your own type serializers
});