add virtual field to model in mvc3 - asp.net-mvc

Question

This is my model class.
namespace Details.Models
{
public class COMPLETE_DETAILS
{
[Key]
public long COMPLETE_DETAIL_ID { get; set; }
public string TRUCK_NO { get; set; }
public string CHALLAN_NO { get; set; }
public string L_R_NO { get; set; }
public string DEALER_NAME { get; set; }
public string SOURCE_DESTINATION { get; set; }
public string ORIGINAL_DESTINATION { get; set; }
public string COMPANY_DESTINATION { get; set; }
public decimal? CEMENT_BAG_NO { get; set; }
public decimal? RATE_PER_BAG { get; set; }
public decimal? TOTAL_COST_PERSONAL { get; set; }
public decimal? TOTAL_COST_COMPANY { get; set; }
public decimal? NET_PROFIT { get; set; }
public Nullable<DateTime> DATE { get; set; }
public decimal? OTHER_EXPENSES { get; set; }
**public virtual long? ROW_NO { get; set; }**
}
}
i want to add a virtual field to my model class but it`s not worked for me. In my data Base the table name is COMPLETE_DETAILS and it has all the field except ROW_NO so there is any another option to make a virtual field in model class of mvc3

Answer 1

I assume that you are using for example Entity Framework to link for example your MS-SQL database with c# class. So, you can list all required properties in c# class and then create new class inherited from COMPLETE_DETAILS with one extra field ROW_NO and calculate it programmaticaly or whatever you wish.
public class COMPLETE_DETAILS_CUSTOM: COMPLETE_DETAILS
{
public virtual long? ROW_NO { get; set; }
}
Some linq code:
using(DbContext Db = new DbContext())
{
List<COMPLETE_DETAILS_CUSTOM> items = Db.COMPLETE_DETAILS_DBSET.Select((item, index)=> new COMPLETE_DETAILS_CUSTOM(){
COMPLETE_DETAIL_ID = item.COMPLETE_DETAIL_ID,
// same with other fields
ROW_NO = index
}).ToList();
}