Origineel

namespace LeerPlatform_Team2
{
    public partial class TblPlanning
    {
        public int PlanningId { get; set; }
        public string Lokaalnummer { get; set; }
        public string Lescode { get; set; }
        public string Reekscode { get; set; }
        [DisplayName("Start tijdstip")]
        public DateTime StartTijdstip { get; set; }
        [DisplayName("Eind tijdstip")]
        public DateTime EindTijdstip { get; set; }
        [DisplayName("Extra info")]
        public string ExtraInfo { get; set; }

        public virtual TblLessen LescodeNavigation { get; set; }
        public virtual TblLokalen LokaalnummerNavigation { get; set; }
        public virtual TblLessenreeks ReekscodeNavigation { get; set; }
    }
}

using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;

namespace LeerPlatform_Team2
{
    public partial class TblLokalen
    {
        public TblLokalen()
        {
            TblPlanning = new HashSet<TblPlanning>();
        }

        [Remote(action: "Validatelokaal", controller:"Lokalen",HttpMethod ="POST", ErrorMessage ="Dit lokaal bestaat al!")]
        public string Lokaalnummer { get; set; }
        public string Locatie { get; set; }
        public int Capaciteit { get; set; }

        public int? FunctionaliteitenId { get; set; }


        public virtual TblFunctionaliteiten Functionaliteiten { get; set; }
        public virtual ICollection<TblPlanning> TblPlanning { get; set; }
    }
}

using System;
using System.Collections.Generic;

namespace LeerPlatform_Team2
{
    public partial class TblLessenreeks
    {
        public TblLessenreeks()
        {
            TblPlanning = new HashSet<TblPlanning>();
        }

        public string Reekscode { get; set; }
        public string Titel { get; set; }
        public int? Ingeschreven { get; set; }

        public virtual ICollection<TblPlanning> TblPlanning { get; set; }
    }
}

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

namespace LeerPlatform_Team2
{
    public partial class TblLessen
    {
        public TblLessen()
        {
            TblPlanning = new HashSet<TblPlanning>();
        }
        [MaxLength(5)]
        [Required]

        public string Lescode { get; set; }
        [Required]
        [MaxLength(50)]
        public string Titel { get; set; }
        [Required]
        [Range(4,25)]
        public int Studiepunten { get; set; }

        public virtual ICollection<TblPlanning> TblPlanning { get; set; }
    }
}