public abstract class Setting
{
    [Required]
    public int SettingId { get; set; }

    public string Name { get; set; }

    [Required]
    [MaxLength(255)]
    public string Value { get; set; }
    public string ModifiedBy { get; set; }
    public DateTime ModifiedDt { get; set; }
}

public class ViewSetting : Setting
{
}

public class EditSetting : Setting
{
}