One-way web service call in BizTalk Orchestration
The default ASP.NET web service behavior is to return a response even if a method returns void, to allow the service to return a fault message. BizTalk Server creates a response message part for the void return. If you are in control of the Web service and it is a .NET Web service, you can specify that a response should not be returned by using the [SoapDocumentMethod(OneWay=true)] attribute, making it truly fire-and-forget.
Sample code looks like this:
[WebMethod]
[SoapDocumentMethod(OneWay=true)]
public void OneWayService ()
{
}
When you add a web reference to your Orchestration project BizTalk now configures the port type to be one-way and the port shape reflects this.