Entity Framework Code First AddOrUpdate method insert Duplicate values

Question

I have simple entity:

public class Hall
{
    [Key]
    public int Id {get; set;}

    public string Name [get; set;}
}

Then in the S

Answer 1

I found out that for this to work, the identity position should be 0 when the seed first run. You can reset it using:

DBCC CHECKIDENT (tableName, RESEED, 0)