Hello Ara,

Here is an example of almost all index construction-related options from the online manual. Notice [Index("HireDate:DESC"... part.

[Index("FirstName",  "LastName")]
[Index("Login", Unique = true, Name = "IX_LOGIN")]
[Index("HireDate:DESC", IncludedFields = new[]{"FirstName", "LastName"})]
public class Employee : Person
{
  [Field, Key]
  public int Id { get; private set; }

  [Field]
  public string Login { get; set; }

  [Field(Length = 20)]
  public string LastName { get; set; }

  [Field(Length = 10)]
  public string FirstName { get; set; }

  [Field]
  public DateTime HireDate { get; set; }

Hope that helps.