Creating string index with Code first

Question

I\'m using Entity Framework 6.1 code-first and my domain model is below.

class Item
{
    [Index]
    public string CreatedBy { set; get; }
} 

Answer 1

Usually you get this error when you use a VARCHAR(Max) try using:

[Column(TypeName = "VARCHAR")]
[StringLength(n)]
[Index]
public string CreatedBy { set; get; }

where n is between 1 and 450.