WCF Connection becomes faulted for no reason - wcf

Question

Or perhaps it has a reason it just does not tell me about.
This is what I am doing to connect my client:
try
{
callback = new Callback();
//my callback implementation
callback.send += new Callback.gotPacket(callback_send);
//Event so the client gets informed when the callback function is
//triggerd.
InstanceContext context = new InstanceContext(callback);
client = new ServiceReference1.WcfInfoHostClient(context);
client.connect();
//This is always working as long as the server is running.
statuslabel.Content = "Conected";
//writing somthing to the GUI
filterentries = client.getFilter();
//this should return a datatable object but it
//always fails due to a ConnectionFaultedException
filtergrid.ItemsSource = filterentries.DefaultView;
//[...]
}
catch (Exception ex)
{
statuslabel.Content = ex.Message;
}
How can the connection become faulted all of a sudden? I added the getFilter Function to the Service interface, to the Service implentation. I refreshed the WCF service DLL in the window service hosting it and I have refreshed all ServiceReferences in all concerning projects.
I dont see what is goning on here....

Answer 1

Thanks for your comments. The problem is that
a) WCF cant use empty DataTables
b) You have to give the DataTable a name.
I changed my implementation to this:
public DataTable getFilter()
{
DataTable result = new DataTable("fascinatingName");
result.Columns.Add(new DataColumn("I", typeof(String)));
result.Columns.Add(new DataColumn("am", typeof(String)));
result.Columns.Add(new DataColumn("a", typeof(String)));
result.Columns.Add(new DataColumn("Test", typeof(String)));
return result;
}
Now the communication is working without problems. Still WCF makes me cry.
Have a fantastic weekend everyone....