How can I convert class to Csv file in C#

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C#

ASP.NET

Visual-Studio

CSV

Hi, I have a class named DataSet

public class DataSet
    {
         private string _title;
        private List<ImageAssociation> _associated_images = new List<ImageAssociation>();
 
        
        public string time_start = "Started";
        
        public string duration { get; set; }
        
        public string title
        { 
            get { return _title; }
            set
            { 
                int length = value.Length > 150 ? 150 : value.Length;
                _title = value.Substring(0, length);
            }
        }
 
        
        public string description { get; set; }
 
        
        public string integration_id { get; set; }
 
        
        public string auction_code { get; set; }
 
        
        public string viewing_information { get; set; }
 
        
        public AuctionPublicationStatus publication_status { get; set; }
 
        public string currency_code { get; set; }
 
        
        public string location_name { get; set; }
 
       
        public string location_description { get; set; }
 
        
        public List<ImageAssociation> associated_images { get { return _associated_images; } }
    }
    }

ImageAssociation class as

public partial class ImageAssociation
    {
        
        public string image_id { get; set; }
        
        public string caption { get; set; }
    }

Now I want to convert values in this class file to a csv file My code for the csv file write is as follows

 protected void Button1_Click(object sender, EventArgs e)
        {
if (!Directory.Exists("E:\\baiju\\Test"))
                {
                    System.IO.Directory.CreateDirectory("E:\\baiju\\Test");
                }
                    using (var sw = new StreamWriter("E:\\baiju\\Test\\Test.csv"))
                    {
                         var writer = new CsvWriter(sw);
                        List<AuctionUpsert> list = new List<AuctionUpsert>();
                        IEnumerable records = list;
                        writer.WriteRecords(records);
                        writer.NextRecord();
                     }
}

While I am doing this Only the field names in the DataSet class are shown in the CSV file. I want the value of each fields in the CSV file.

NB:- And the associated_images and start_time(That has value "started" by default) fields are not available there also.
Thanks in advance.