What part of the message don't you understand?  Parameterless?  Or
Constructor?

-----Original Message-----
From: vncntj [mailto:vncntj@hotmail.com]
Posted At: Saturday, November 24, 2007 7:08 PM
Posted To: microsoft.public.dotnet.framework.aspnet.webservices
Conversation: Newbie: does not have a parameterless constructor
Subject: Newbie: does not have a parameterless constructor

I'm working on my first Web Service and need to display data from a
Sql Database.  I get this error message:

"Telemarketing.TUsers cannot be serialized because it does not have a
parameterless constructor."

I have my "proxy ?" content page TUsers.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data;

namespace Telemarketing
{
   public class TUsers
   {

       #region Properties
       private string mReason;
       private string mReid;

       public string Reason
       {
           get
           {
               return mReason;
           }
           set
           {
               mReason = value;
           }
       }

       public string Reid
       {
           get
           {
               return mReid;
           }
           set
           {
               mReid = value;
           }
       }

       #endregion

       #region Methods
       public TUsers(string Reason, string Reid)
       {
           mReason = Reason;
           mReid = Reid;
       }

   }
       #endregion

   public class ListTUsers
        {

            public List<TUsers> TUsers
            {
                get
                {
                    List<TUsers> lst = new
List<TUsers>();

                    DataTable dt =
GetTUsers().Tables["tno"];
                    foreach (DataRow dr in dt.Rows)
                    {
                        TUsers t = new
TUsers(dr["Reason"].ToString(),
dr["Re_id"].ToString());
                        lst.Add(t);
                    }
                    return lst;
                }
            }

            internal DataSet GetTUsers()
            {
                string SQL = "Select Reason, Re_id From
tno";
                SqlDataAdapter da = new
SqlDataAdapter(SQL, Conn.ConnString);
                DataSet ds = new DataSet();
                da.Fill(ds, "tno");
                return ds;
            }
        }
}

and the BlogService.cs codebehind page for BlogService.asmx

using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Collections.Generic;
using Telemarketing;

/// <summary>
/// Summary description for BlogService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class BlogService : System.Web.Services.WebService {

   public BlogService () {

       //Uncomment the following line if using designed components
       //InitializeComponent();
   }

   [WebMethod()]
   public List<Telemarketing.TUsers> ListTUsers()
   {
       ListTUsers lt = new ListTUsers();
       return lt.TUsers;

   }
}

Thanks