[c#] Setting unique Constraint with fluent API?

@coni2k 's answer is correct however you must add [StringLength] attribute for it to work otherwise you will get an invalid key exception (Example bellow).

[StringLength(65)]
[Index("IX_FirstNameLastName", 1, IsUnique = true)]
public string FirstName { get; set; }

[StringLength(65)]
[Index("IX_FirstNameLastName", 2, IsUnique = true)]
public string LastName { get; set; }

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