I have a WCF service written using C# 3 which take some data as input and add theses data to a database and returns a GUID back to the client. I've created a VB.net console client to test this unfortunately I am getting Guid.Empty in the client even though the service returns a GUID from,same thing works correctly with C# 3 client. Any idea why this different behavior in C# and VB.net?