Re: web service issue

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"esource" <darrenpaul@xxxxxxx> wrote in message news:1186000686.219397.65420@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
hi all
I created a web service with one web method:
<WebMethod()> Public Function RequestPremium(ByVal web_request As
XmlDocument) As XmlDocument

it basically accepts a xmldocument then queries a database and returns
results in a xmldocument
I've confirmed that the code in the web method works, it fails when
the web method tries to return the new xmldocument:
last couple of lines in web method...
o_xmlreturn.Save("C:\temp\WS.xml") ' this works, xmldocument has
data and saves to the web server in c:temp
RequestPremium = o_xmlreturn ' this fails when it returns back to
calling program

my calling program is just a test windows vb.net app. the calling
lines are
ws_webservice = New WebService.POCservice ' web reference
ws_webservice.Credentials = New System.Net.NetworkCredential("user",
"pwd", "domain")
xml_return = ws_WIS_webservice.RequestPremium(xml_send)

error message in calling program is:
"system.invalidcastexception: specified cast is not valid"

can you return a xmldocument in a web service? I passed one and it
worked fine, just won't return it
any help would be appreciated. thanks

You say that the exception is in the calling code, yet you posted the code of the service. Did you look at the calling code (that is, at the proxy class)?

If you look at your proxy class (Reference.vb usually), you'll see that the proxy method returns XmlNode, not XmlDocument.
--
John Saunders [MVP]

.

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