moadiran/Back/Data/Models/OrderItem.cs

using System.ComponentModel.DataAnnotations.Schema;

namespace  Back.Data.Models
{
    public class OrderItem
    {
        public int ID { get; set; }
        public int OrderID { get; set; }
        public int? PermissionID { get; set; }
        public int? PromotionID { get; set; }
        public int CreditAmount { get; set; }
        public decimal APrice { get; set; }
        public decimal Discount { get; set; }
        public decimal Tax { get; set; }
        public decimal Total { get { return (CreditAmount * APrice) - Discount + Tax; } }

        #region Navigation
        [ForeignKey("OrderID")]
        public virtual Order Order { get; set; }
        [ForeignKey("PermissionID")]
        public virtual Permission? Permission { get; set; }
        [ForeignKey("PromotionID")]
        public virtual Promotion? Promotion { get; set; }
        #endregion
    }
}