List Processing - Losing list data between controller and model

I am creating a webAPI which returns 2 columns to a  list as 1 row When I test with powermon or
via html I only return [{}] . I know I have captured the data because I see the row in visual studio.

For some reason when I return to the controller the data that is in the model packet
for return from controller the data is missing returning only see  [{}]

Can anyone offer a solution or suggestions.

I'm under the gun.

Isaac

// Controller

using PicOfDay;
using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using PicOfDay.Models;
using Newtonsoft.Json;
using System.Data;

namespace PicOfDay.Controllers
    
{
    public class PicOfDayController : ApiController
    {
        [Route("api/PicOfDay/pic_of_day/{id}")]
        [HttpGet]
        public IHttpActionResult pic_of_day(string id)
        {
             

            try
            {

                List<PictureOfDay> PicDateCaption = new List<PictureOfDay>();
                var picofday = new PictureOfDay();

                picofday.pic_of_day(PicDateCaption, id);

                return Ok(PicDateCaption);

            }
            catch (Exception ex)
            {
                return InternalServerError(ex);
            }
        }
    }
}

//=========================================

//Model

///=========================================

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Data.SqlClient;
using System.Collections;
using UtilityServices;
using DataLayerServices;
using InsightDataServices;
using System.Data;

namespace PicOfDay.Models
{
    public class PictureOfDay
    {
        //string showCounts = "1";
        //int TotalCount;
        string Pic_Date;
        string Pic_Caption;

        public List<PictureOfDay> pic_of_day(List<PictureOfDay> PicDateCaption, string Date_In)
        {

            using (var con = Database.GetConnection())
            {
                // Find Pic Of Day
                using (SqlCommand command = new SqlCommand("insight_sel_pic_day", con))
                {
                    command.CommandType = System.Data.CommandType.StoredProcedure;

                    con.Open();

                    command.Parameters.Add(new SqlParameter("@INpic_date", System.Data.SqlDbType.NChar)).Value = Date_In;
                    using (SqlDataReader rdr = command.ExecuteReader())
                        // Locate Picture
                        if (rdr.HasRows)
                            while (rdr.Read())
                            {
                                PictureOfDay picData = new PictureOfDay();

                                picData.Pic_Date = Date_In.ToString(); 

                                picData.Pic_Caption = rdr["caption"].ToString();

                                PicDateCaption.Add(picData);


                            }

                    con.Close();
                     
                    return PicDateCaption;
                }
            }
        }
    }

}

//===================================================

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