Department.cs

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace GraphQLSampleApp.DataAccess.Entity
{
    public class Department
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int DepartmentId { get; set; }

        public string Name { get; set; }

        public ICollection<Employee> Employees { get; set; }
    }
}