Imports System
Imports System.IO
Imports System.Collections
Imports System.Collections.Generic
Imports System.Runtime.Serialization
Imports ServiceStack
Imports ServiceStack.DataAnnotations
Imports Test.ServiceModel
Namespace Global
    Namespace Test.ServiceModel
        Public Partial Class HelloResponse
            Public Overridable Property Result As String
        End Class
        Public Partial Class HelloWithNestedClass
            Public Overridable Property Name As String
            Public Overridable Property NestedClassProp As NestedClass
            Public Partial Class NestedClass
                Public Overridable Property Value As String
            End Class
        End Class
    End Namespace
End Namespace
VB.NET HelloWithNestedClass DTOs
To override the Content-type in your clients, use the HTTP Accept Header, append the .json suffix or ?format=json
To embed the response in a jsonp callback, append ?callback=myCallback
The following are sample HTTP requests and responses. The placeholders shown need to be replaced with actual values.
POST /json/reply/HelloWithNestedClass HTTP/1.1 
Host: test.servicestack.net 
Accept: application/json
Content-Type: application/json
Content-Length: length
{"name":"String","nestedClassProp":{"value":"String"}}
HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: length
{"result":"String"}