How To Suppress Certain Class Items On XML Output For Web Service

Hi,
I have web service that outputs to xml more information than I'd like to output. I need to understand how to suppress some of the class fields that appear in the xml output that I don't reference explicitly. It seems item types such as "DateTime" and "bool" automatically get added, whereas "string" does not.

1. The first snippet makes the call and returns the list in xml format
2. The second snippet has the classes with the data elements
3. The third snippet is how I create the list
4. The image is the result.

As you can see in the image despite only assigning "Product_Name" to the "obj" from myReader (in bold)
                SqlDataReader myReader = null;

                string sqlStatement = "SELECT " +
                    " Product_Name " +
                    " FROM Physician_Training_Lookup " +
                    " WHERE Physician_Training_Lookup.Physician_Info_ID = " + @searchCriteria +
                    " ORDER BY Physician_Training_Lookup.Product_Name ";

                SqlCommand SqlCommand = new SqlCommand(sqlStatement, SqlServer);
                SqlCommand.Parameters.Add(new SqlParameter("@searchCriteria", searchCriteria));

                myReader = SqlCommand.ExecuteReader();
                while (myReader.Read())
                {
                    obj = new PhysicianTraining();

                    //Bring in the product value from the Product class
                    obj.Product = new Product();
                    Product TrainingProd = new Product();
                    obj.Product.Name = myReader["Product_Name"].ToString();                              

                    physicianList.Add(obj);
                }

 the output brings back many of the other class items, such as Date, Product_ID, Fellow, etc.

What's the best way to suppress the class items that seem to want to come through?

Cheers,
Ty

[Description("Get a hydrated physician list in XML format")]
        [WebGet(UriTemplate = "/physiciantraining.xml?searchCriteria={searchCriteria}", ResponseFormat = WebMessageFormat.Xml)]
        [OperationContract]
        [XmlSerializerFormat]
        public List<PhysicianTraining> GetPhysicianTrainingList(string searchCriteria)
        {
            clsPhysicianTrainingList = new EndoPhysicianData();
            List<PhysicianTraining> resultList = clsPhysicianTrainingList.GetPhysicianTrainingList(searchCriteria: searchCriteria);
            return resultList;
        }

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Medtronic.Mobile.EndoPhysician.BusinessObjects
{
    public class PhysicianTraining
    {
        public DateTime Date { get; set; }
        public Product Product { get; set; }
        public Physician Physician { get; set; }
        public string SignatureImageBytes { get; set; } 
        public Account AffiliatedAccount { get; set; }
        public User CCE { get; set; }
        public bool Fellow { get; set; }
        public string FellowGradYear { get; set; }
        public bool VS { get; set; }
        public bool IR { get; set; }
        public bool CT { get; set; }
        public bool IC { get; set; }

    }
}



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Medtronic.Mobile.EndoPhysician.BusinessObjects
{
    public class Product
    {
        public int Product_ID { get; set; }
        public string Name { get; set; }
        public string Checklist { get; set; }
    }
}

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public List<PhysicianTraining> GetPhysicianTrainingList(string searchCriteria)
        {

            //Make sure something was passed
            if (String.IsNullOrEmpty(searchCriteria))
            {
                searchCriteria = "0";
            }

            var physicianList = new List<PhysicianTraining>();
            var obj = new PhysicianTraining();

            //Open the connection
            try
            {
                SqlServer.Open();
            }
            catch (Exception e)
            {
                ErrorMessageOpening = e.ToString();
            }


            //Run the sql query
            try
            {
                SqlDataReader myReader = null;

                string sqlStatement = "SELECT " +
                    " Product_Name " +
                    " FROM Physician_Training_Lookup " +
                    " WHERE Physician_Training_Lookup.Physician_Info_ID = " + @searchCriteria +
                    " ORDER BY Physician_Training_Lookup.Product_Name ";

                SqlCommand SqlCommand = new SqlCommand(sqlStatement, SqlServer);
                SqlCommand.Parameters.Add(new SqlParameter("@searchCriteria", searchCriteria));

                myReader = SqlCommand.ExecuteReader();
                while (myReader.Read())
                {
                    obj = new PhysicianTraining();

                    //Bring in the product value from the Product class
                    obj.Product = new Product();
                    Product TrainingProd = new Product();
                    obj.Product.Name = myReader["Product_Name"].ToString();

                    physicianList.Add(obj);
                }
            }
            catch (Exception e)
            {
                ErrorMessageSQLSelect = e.ToString();
            }



            //Close the connection
            try
            {
                SqlServer.Close();
            }
            catch (Exception e)
            {
                ErrorMessageClosing = e.ToString();
            }

            return physicianList;
        }

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ArrayXML.jpg