using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.ComponentModel.DataAnnotations; namespace Domain { public class Cource { public int CourceId { get; set; } // if not required, use nullable int - int?. Dadabase pics it up // always specify foregin key manualy public int SubjectId { get; set; } public Subject Subject { get; set; } public virtual List Persons { get; set; } = new List(); } }