You can use any dll or .net assembly so long as it is installed on the
iis server:

Open a new web service project > Right click references > Add
reference.

If it's a .net assembly select it from the list or browse to it's
location.

If it's a dll do the same in the COM tab.

You can then make calls against your component.

You can use any dll or .net assembly so long as it is installed on the
iis server:

Open a new web service project > Right click references > Add
reference.

If it's a .net assembly select it from the list or browse to it's
location.

If it's a dll do the same in the COM tab.

You can then make calls against your component.

Hi,
I'm not 100% sure on exactly what you are trying to achieve. You want a
client to call your webservice, but validate the data they send to you before
a web method is called? Do you want this to be done:
a) On the client before calling your webservice
b) In the Webservice, but prior to the request being dispatched to a WebMethod
c) In the WebService, but you just want to validate the data in the web
method?

If you want b), this article details how to perform XSD validation prior to
your WebMethod being called, which even if you don't want XSD validation,
shows how to achieve validation:
http://msdn.microsoft.com/msdnmag/issues/02/11/XMLFiles/

If you want c), you can simply write an assembly which is referenced by your
webservice and you call the validation in each webmethod.

Let me know if that helps and if you need any more details
Thanks,
Dave