Error In Add Record

Question

User338455301 posted

Hi,
When I Add Record In Asp.net Core Mvc , the record is added but after that it's show this error.
what's problem?

City

 public City()
        {

        }
        [Key]
        public int City_ID { get; set; }
        [DisplayName("نام شهر")]
        [Required(ErrorMessage = "لطفا {0} را وارد نمایید")]
        [MaxLength(50)]
        public string CityName { get; set; }
        [DisplayName("کد شهر")]
        [Column(TypeName = "varchar(10)")]
        public string CityCode { get; set; }
        [DisplayName("وضعیت")]
        public bool IsActive { get; set; }
        [DisplayName("استان")]
        public virtual State State { get; set; }
        [DisplayName("استان")]

        public int State_ID { get; set; }

        public virtual IEnumerable<CustomerAddress> CustomerAddresses { get; set; }

State

   [Key]
        public int State_ID { get; set; }
        [DisplayName("نام استان")]
        [Required(ErrorMessage = "لطفا {0} را وارد نمایید")]
        [MaxLength(50)]
        public string StateName { get; set; }
        [DisplayName("کد استان")]
        [Column(TypeName = "varchar(10)")]
        public string StateCode { get; set; }
        [DisplayName("وضعیت")]
        public bool IsActive { get; set; }
        [DisplayName("کشور")]
        [ForeignKey("Country")]
        public int CountryId { get; set; }

        public virtual Country Country { get; set; }
        public virtual List<City> Cities { get; set; }
        public virtual IEnumerable<CustomerAddress> CustomerAddresses { get; set; }

Answer 1

User753101303 posted

Hi,

It means you try to add a City with a State_ID value that doesn't match a primary key value found in the State_tb column.

In plain English, you try to add  a city which doesn't belong to an existing state.