Calling web service using SSIS script task. Request and response

Hi,

I was given a webservice url and has different webmethods. I want to call this web service and generate the request and get the response.

I need to consume this using SSIS script task. I can't use web service task as the WSDL file has complex types which is not supported.

I am able to call the web service using HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strURL);

How do I get the SOAP envelop XML string?

I need to use the SOAP envelop xml string as

XmlDocument soapEnv = new XMLDocument();

soapEnc.LoadXml(soapenvxml);

thanks