for_vika/praktika_2/category.cs

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

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

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

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

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

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