public partial class User
    {
        public int UserId { get; set; }
        public string Email { get; set; }
        public string Password { get; set; }
        public Nullable<int> RoleID { get; set; }

        public virtual Role Role { get; set; }
    }
   public partial class Role
    {
        public Role()
        {
            Users = new HashSet<User>();
        }

        public int RoleId { get; set; }
        public string RoleName { get; set; }

        public virtual ICollection<User> Users { get; set; }
    }


   public partial class AppDBContext : DbContext
    {
  
        public virtual DbSet<Role> Role  { get; set; }
        public virtual DbSet<User> User  { get; set; }
 }

     var u = db.Users.FirstOrDefault();
            var rr = u.Role;