EF_Code_First/EF_Code_First/Models/Grade.cs

using System.ComponentModel.DataAnnotations.Schema;

namespace EF_Code_First.Models
{
    public class Grade
    {
        public int GradeId { get; set; }
        public string? GradeName { get; set; }
        public string? Section { get; set; }
        [ForeignKey ("StudentId")]
        public ICollection<Student>? Students { get; set; }
    }
}