web service issue

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. thanksIf I recall correctly, it will be happier returning an XmlNodeList or
XmlDocumentFragment. Try that.
Peter
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"esource" wrote:

> 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
>
"esource" <darrenpaul@.shaw.ca> wrote in message
news:1186000686.219397.65420@.l70g2000hse.googlegroups.com...
> 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]
On Aug 1, 5:34 pm, "John Saunders [MVP]" <john.saunders at
trizetto.com> wrote:
> "esource" <darrenp...@.shaw.ca> wrote in message
> news:1186000686.219397.65420@.l70g2000hse.googlegroups.com...
>
>
>
>
>
>
>
> 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 th
e
> proxy method returns XmlNode, not XmlDocument.
> --
> John Saunders [MVP]- Hide quoted text -
> - Show quoted text -
thanks both of you.
Your right, I checked the web reference in my calling program in
reference.vb and the implementation was xmlnode even though I declared
it as xmldocument in my web service. I changed it and it worked.
thanks again