WCF querying an array of objects

I’m still working on a WCF solution that should be able to query the backend of the program and return the results. The backend stores a dictionary of objects called `Groups` and they can be queried with functions like: - `GetGroup` to get a single group by ID - `GetGroups` to get a list of groups by tags. The `GetGroup` works fine with the WCF Test Client and the application I have built. And it works with the following code form the application: ``` List<string> values = new List<string>(); GroupServiceClient client = new GroupServiceClient("WSHttpBinding_IGroupService"); www.test.co.uk.programme.programme Group = new www.test.co.uk.programme.programme(); DateTime time = DateTime.Now; values.Clear(); client.Open(); Group.number = textBox1.Text; client.GetGroup(ref time, ref Group); GroupStorageMessage toReturn = new GroupStorageMessage(); toReturn.group = Group; selectedGroupId = Convert.ToString(toReturn.group.number); values.Add(Convert.ToString(toReturn.group.number)); values.Add(Convert.ToString(toReturn.group.name)); listBox1.ItemsSource=values; client.Close(); ``` The `GetGroups` works perfectly with WCF Test Client but not with my application. It sends the query as it should but it does return `Null` (please note that this code is form another app and I’m using a reference instead of a proxy file) ``` ServiceReference1.programme Group = new ServiceReference1.programme(); ServiceReference1.GroupServiceClient Client = new ServiceReference1.GroupServiceClient(); DateTime Time = DateTime.Now; Client.Open(); string[] aa = new string[1]; aa[0] = textBox1.Text; Group.tags = aa; Client.GetGroups(ref Time, Group); ServiceReference1.GroupArrayMessage toReturn = new ServiceReference1.GroupArrayMessage(); ServiceReference1.programme[] Groups = new ServiceReference1.programme[1]; toReturn.groups = Groups; = returns null ``` in new ServiceReference1.programme[1]; I am actually guessing what to put there. Interface: ``` [ServiceContract(Namespace = "http://www.Test.co.uk/groupstorage")] public interface IGroupStorageService { /** * Get a group from the collection of groups */ [OperationContract] GroupStorageMessage GetGroup(GroupStorageMessage message); /** * Add a group to the collection of groups */ [OperationContract] void AddGroup(GroupStorageMessage message); /** * Remove a group from the collection of groups */ [OperationContract] void RemoveGroup(GroupStorageMessage message); /** * Update a group in the collection of groups */ [OperationContract] void UpdateGroup(GroupStorageMessage message); [OperationContract] GroupArrayMessage GetGroups(GroupStorageMessage message); } ``` Message Contract: ``` [MessageContract] public class GroupArrayMessage { /** * Message header is the timestamp when the message was created */ [MessageHeader(Name = "time")] public DateTime Time; /** * Message body is a collection of Users */ [MessageBodyMember(Name = "groups")] public Group[] Groups; } ``` Group contact (sometimes referred as programme) ``` [DataContract(Namespace = "http://www.test.co.uk/programme", Name = "programme")] public class Group { /** * The number representing the Programme (Programme ID) */ [DataMember(Name = "number")] public string Number; /** * The name of the Programme */ [DataMember(Name = "name")] public string Name; /// <summary> /// Add Tags /// </summary> [DataMember(Name = "tags")] public string[] Tags; ```