activating a SOAP extension from the client

[Robert Rotstein]

I want to write a SOAP extension that gets activated from both the
client and the server. From whast I have read, this should be quite
easy to do. Yet I can only activate it from the server.

I have a service (.asmx file) which contains the following:

namespace OfficerCallIn
{
[WebService(Name ="OfficerCallIn Service",
Namespace="TheO fficerCallInSer vice")]
public class OfficerCallInSe rvice :
System.Web.Serv ices.WebService
{

. . .

[WebServiceHeade rExtension.Cryp toSOAPExtAttrib ute]
[WebMethod(Enabl eSession=true)]
public void ProcessOfficerL ocationAndStatu s { ... }
}
}

The SOAP extension file looks like this:

namespace WebServiceHeade rExtension
{
[AttributeUsage( AttributeTarget s.Method)]
public class CryptoSOAPExtAt tribute :
System.Web.Serv ices.Protocols. SoapExtensionAt tribute
{
...

public override Type ExtensionType
{get { return typeof(CryptoSO APExt); }}
}

public class CryptoSOAPExt :
System.Web.Serv ices.Protocols. SoapExtension
{
... // the usual methods
}
}

and the client call looks like this:

OfficerCallInSe rvice srvc = new OfficerCallInSe rvice();
srvc.ProcessOff icerLocationAnd Status( . . .);

The intention is to put some encryption/decryption code, currently
residing in the client, into the SOAP extension. Right now, the
extension methods are essentially empty, containing nothing more than
the usual boilerplate code and a few MessageBox() pop-ups to signal that
they are being activated.

I can see that the service is activating the SOAP code, since the
pattern of activations is: BeforeDeseriali ze, AfterDeserializ e,
BeforeSerialize , AfterSerialize. This is the standard server-side
pattern. But what must I do to get the client to activate the SOAP
extensions? I'm sure that I am overlooking something perfectly simple
and obvious, but, as I am a beginner at this material, I don't know what
it is. Can someone clue me in?