Calling Java web service from windows application

Question

Hi, I have a windows Form where we can select any XML file. On click of a button, I need to call a Java web service which accepts the XML file through HTTP Post. I have made a dynamic URL for calling the Java web service. But iam confused how to go ahead.. I know only the webMethod name. I dont know the Datatype of input arguments and return type of the Java web service. But still I need to communicate with Java web service with C# client. Is anybody having solution or any website address ? Thanks in advance,