WCF datacontract problem, unable to see all datacontract

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C#

WCF

I am working on a wcf project. at service side I defined datacontract like that

[ServiceContract]
 public interface IDictionaryService
 {
     [OperationContract]
     TranslationData TranslateWord(TranslationData tData);
 }
 [DataContract]
 public class TranslationData
 {
     ........
 }

I successfully used the TranslationData instance on client side. then I add two more datacontract , problem is I can't see the two new added datacontract and unable to define their instance on client side. I updated the service and did everything but it dose not work.
is there any one who tell me why that happend?

whole code is shown as below

[ServiceContract]
 public interface IDictionaryService
 {
     [OperationContract]
     TranslationData TranslateWord(TranslationData tData);
 }
 [DataContract]
 public class TranslationData
 {
     ...........................
 }

 [DataContract]
 public class SerachItem
 {
     .................................
 }

 [DataContract]
 public class TargetItem
 {
     .....................................
 }

in short I am unable to use all datacontract on client side, why?