WCF Globalization Pattern Help

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WCF

Hi,

How can client set a locale using second appraoch(applying attribute on service method)

Service:

[Microsoft.ServiceModel.Samples.Internationalization]
public string HelloWorld()
{

}

Client:

HelloworldClient client = new HelloWorldClient();
client.HelloWorld();

from the above two lines of code, how the client send locale info to the WCF Service ....?

I understood FirstApproach.. because its setting through message header. But I can't change my datacontracts to message contracts.. so I need second approach...

Any help will be appreciated.