SOAPUI result always adds his default envelope, why?

Dear all

i created my WebSerivce using C#, VS2010.

everything is working very good, but the problem is that it adds my envelope inside its envelope, like this:

[color=#FF0000]<soap:Envelope xmlns:soap[/color]="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <soap:Body>
      <processRequestResponse xmlns="http://bussinessfacade.fawryswitch.ebpp.fawryis.com/">
         <processRequestResult>
            [color=#FFFF00]<soapenv:Envelope xmlns:soapenv[/color]="http://schemas.xmlsoap.org/soap/envelope/" xmlns:bus="http://bussinessfacade.fawryswitch.ebpp.fawryis.com/">
               <soapenv:Header/>
               <soapenv:Body>
                  <bus:processRequestResponse>

the issue is that you will find that my envelope is added inside the envelope added by SOAPUI tool.

i want only my envelope to appear.

how can i fix this ?