EF will not create columns RULE

using System.ComponentModel.DataAnnotations;

public class Student
{
    private int _age = 0;

    public int StudentId { get; set; }
    public string StudentName { get; set; }
    public string City { get{ return StudentName;}  }
    public int Age { set{ _age = value;}  }
}

Source: entityframeworktutorial.net

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