SOAP action error from AXIS

I'm consuming a Java based Web Service with C# .NET app.

I'm sending a SOAP message in XML format.

But I'm receiving th开发者_如何学编程is error message:

ns1:Client.NoSOAPAction no SOAPAction header

---

You need to look at the WSDL for your service.

The SOAPAction is effectivly the URL you are sending the soap envelope to, so whatever software you are using should set this up in the http headers.