for_vika/praktika_2/organizations.cs

namespace praktika_2
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;
    using System.ComponentModel.DataAnnotations.Schema;
    using System.Data.Entity.Spatial;

    public partial class organizations
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public organizations()
        {
            material_value_accounting = new HashSet<material_value_accounting>();
        }

        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        public int id_org { get; set; }

        [Required]
        [StringLength(50)]
        public string name { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<material_value_accounting> material_value_accounting { get; set; }
    }
}