ToString Method Overriding DataContract in WCF

Even though I have a redundant ToString method in the DataContract, returning the value of the ActivityType.Code property for the ActivityType class. I still do not get the value of the ActivityType.Code property on the client for binding grid.can one, let me know how the ToString method will be available for the Client.

Here is the code base

Data contract

  [DataContract]
    public class Activity
    {
        [DataMember]
        public ActivityType ActivityTypeId { get; set; }
        [DataMember]
        public string Code { get; set; }
        [DataMember]
        public string Description { get; set; }
        [DataMember]
        public EntityStatus Status { get; set; }

    }
    [DataContract]
    public enum EntityStatus
    {
        [EnumMember]
        Active = 0,
        [EnumMember]
        Inactive = 1
    }

    [DataContract]
    public class ActivityType
    {
        [DataMember]
        public string Code { get; set; }
        [DataMember]
        public string Name { get; set; }
        [DataMember]
        public string Description { get; set; }

        public override string ToString()
        {
            if (Code != null)
            {
                return Code.ToString(CultureInfo.InvariantCulture);
            }
            else
            {
                return base.ToString();
            }
        }
    }

Service implementation

  public class TimeSheetManagementService : ITimeSheetManagementService
    {
        public List<BusinessEntities.Activity> GetActivities()
        {
            TimeSheetManagementDataController controller = new TimeSheetManagementDataController();


            var activities = controller.GetActivities();
            var activitiesresult = activities.Select(activity => new BusinessEntities.Activity()
                                                                     {
                                                                         ActivityTypeId =
                                                                             new BusinessEntities.ActivityType()
                                                                                 {
                                                                                     Code = activity.ActivityType.Code,
                                                                                     Description =
                                                                                         activity.ActivityType.
                                                                                         Description,
                                                                                     Name = activity.ActivityType.Name
                                                                                 },
                                                                         Code = activity.Code,
                                                                         Description = activity.Description,
                                                                         Status =  (EntityStatus)  Enum.Parse(typeof(EntityStatus),Convert.ToString((activity.Status==true)?1:0))
                                                                     });

            return activitiesresult.ToList();
        }
    }

Customer implementation

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
            <Columns>
             <asp:BoundField runat="server" DataField="Code"/>

             <asp:BoundField runat="server" DataField="Description"/>

             <asp:BoundField runat="server" DataField="Status"/>

             <asp:BoundField runat="server" DataField="ActivityTypeId"/>
            </Columns>
        </asp:GridView>

Output

  Code Description                   Status    ActivityTypeId
    ACT2    Requirement Feasibility Study Inactive TimeSheetManagementServiceRef.ActivityType
    ACT1    Requirement analysis    Inactive     TimeSheetManagementServiceRef.ActivityType