How can I add my attributes to Code-Generated Linq2Sql classes properties?

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You can take advantage of the new Metadata functionality in the System.ComponentModel.DataAnnotations which will allow us to separate the MetaData from the existing domain model.

For example:

[MetadataType (typeof (BookingMetadata))]
public partial class Booking
{
 // This is your custom partial class     
}

public class BookingMetadata
{
 [Required] [StringLength(15)]
 public object ClientName { get; set; }

 [Range(1, 20)]
 public object NumberOfGuests { get; set; }

 [Required] [DataType(DataType.Date)]
 public object ArrivalDate { get; set; }
}

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