c# - Error in asp.net webservice -

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my asmx webservice this

   using system; using system.collections.generic; using system.data; using system.web; using system.web.script.services; using system.web.services; using newtonsoft.json;  [webservice(namespace = "http://tempuri.org/")] [webservicebinding(conformsto = wsiprofiles.basicprofile1_1)] [scriptservice] public class getraterequestdata : webservice {     [webmethod]     [scriptmethod(responseformat = responseformat.json)]     public string getparcellookupdata()     {              return jsonconvert.serializeobject(dataset, formatting.indented);      } }

and trying access data in browser this

http://localhost:53569/services/getraterequestdata.asmx/getparcellookupdata/

but throws error like

    system.invalidoperationexception: getparcellookupdata/ web service method name not valid.    @ system.web.services.protocols.httpserverprotocol.initialize()    @ system.web.services.protocols.serverprotocolfactory.create(type type, httpcontext context, httprequest request, httpresponse response, boolean& abortprocessing)

i new webservices, can 1 point out doing wrong here?

you can decorate method allow http requests

[webmethod]   [scriptmethod(usehttpget=true)] public string mymethod(int myint) {     // ... code here }

and change config below 

<system.web> <webservices>   <protocols>     <add name="httpget"/> </protocols> </webservices>

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