Issue in mapping property from excel data table to list

I have testdata model, and I want to map the column values to existing class hierarchy property's and currently it is not mapping the values and shows NULL value

For instance in test data model i have field paymentOptions and in excel sheet the value is KlarnaOptions but after the map of datatable to list - the value of paymentOptions is showing NULL

Test Data Model

<pre>namespace AutoFramework.Model.Excel
{
    public partial class TestDataModel
    {
        
        public TestDataModel() {

            
        }
        
        
        [DataNames("TestName")]
        public string TestName { get; set; }

        

        [DataNames("productId")]
        public int productId { get; set; }

        [DataNames("orderId")]
        public int orderId { get; set; }

        
        [DataNames("designMethod")]
        public DesignMethod designMethod { get; set; }

        [DataNames("signedIn")]
        public bool signedIn { get; set; }

        [DataNames("increaseBasketQty")]
        public bool increaseBasketQty { get; set; }

        [DataNames("signedInCMS")]
        public bool signedInCMS { get; set; }

        [DataNames("editable")]
        public bool editable { get; set; }

        [DataNames("paymentOptions")]
        public PaymentOptions paymentOptions { get; set; }

        [DataNames("checkInVoice")]
        public bool checkInVoice { get; set; }

        [DataNames("navigateToDesign")]
        public bool navigateToDesign { get; set; }

        [DataNames("checkOrderAuthorsie")]
        public bool checkOrderAuthorsie { get; set; }

        [DataNames("checkSplitOrder")]
        public bool checkSplitOrder { get; set; }

        [DataNames("SiteId")]
        public string SiteId { get; set; }

        [DataNames("SiteUrl")]
        public string SiteUrl { get; set; }

        [DataNames("CultureCode")]
        public string CultureCode { get; set; }

        [DataNames("SiteGroupId")]
        public string SiteGroupId { get; set; }

        [DataNames("NickName")]
        public string NickName { get; set; }

        [DataNames("byCard")]
        public KlarnaOptions byCard { get; set; }

        [DataNames("payLater")]
        public bool payLater { get; set; }

        [DataNames("sliceIt")]
        public bool sliceIt { get; set; }

        [DataNames("portal")]
        public PaymentPortal portal { get; set; }

        [DataNames("delivery")]
        public DeliveryMethod delivery{get;set;}

    }
    
}

Mapper for converting Datatable to list

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Framework.Model.Excel
{
    public class DataNamesMapper<TEntity> where TEntity : class, new()
    {
        public TEntity Map(DataRow row)
        {
            TEntity entity = new TEntity();
            return Map(row, entity);
        }

        public TEntity Map(DataRow row, TEntity entity)
        {
            var columnNames = row.Table.Columns.Cast<DataColumn>().Select(x => x.ColumnName).ToList();
            var properties = (typeof(TEntity)).GetProperties()
                                              .Where(x => x.GetCustomAttributes(typeof(DataNamesAttribute), true).Any())
                                              .ToList();
            foreach (var prop in properties)
            {
                PropertyMapHelper.Map(typeof(TEntity), row, prop, entity);
            }

            return entity;
        }

        public IEnumerable<TEntity> Map(DataTable table)
        {
            List<TEntity> entities = new List<TEntity>();
            var columnNames = table.Columns.Cast<DataColumn>().Select(x => x.ColumnName).ToList();
            var properties = (typeof(TEntity)).GetProperties()
                                              .Where(x => x.GetCustomAttributes(typeof(DataNamesAttribute), true).Any())
                                              .ToList();
            foreach (DataRow row in table.Rows)
            {
                TEntity entity = new TEntity();
                foreach (var prop in properties)
                {
                    PropertyMapHelper.Map(typeof(TEntity), row, prop, entity);
                }
                entities.Add(entity);
            }

            return entities;
        }
    }
}


Existing Property Type:

public class PaymentOptions
    {
        public PaymentPortal portal;
        public DeliveryMethod delivery = DeliveryMethod.Billing;

        public PaymentOptions()
        {
        }
        public PaymentOptions(Site site)
        {

        }
    }

public class KlarnaOptions : PaymentOptions
    {
        //default - don't use card payment by deffault
        public bool byCard = false;
        public bool payLater = false;
        public bool sliceIt = false;
        public KlarnaOptions()
        {
            portal = PaymentPortal.Klarna;
        }
    }