SOAP Web Service to be used without WSDL

Hello guys,

I have added a web reference from a WSDL file (system file path e.g. C:\MyWsdl.wsdl)

It generated the certain classes and other files and now when I call its Open method the state of the service client is open. Meaning, it works fine.

I have this newly generated data in the web.config:

<endpoint address="https://preprodservices.ws.ch/ss/SoapServiceV1"
        binding="customBinding" bindingConfiguration="SoapServiceBindingV1_0"
        contract="ServiceReference1.SoapServicePortTypeV1_0" name="SoapServicePortV1_0" />

My question is how do I consume this same WS without adding a reference. Rather I want to call it directly using the HttpWebRequest and response classes.

When I try I get error 500.

Any suggestions are welcome and greatly appreciated