i am new to this forum. i have a peculiar problem with Web services and interop. i created a web service application(server). I generated the SErver STub code from WSDL Generator Tool. this tool creates a .cs file which contains server stub code. i included this file in my project and that becomes my Web server. Apart from this whenever i get a function call from client, i just call the functions in a COM dll ( which i included through references). When I call the API in the dll, from the server, i am sending a structure as parameter, by ref. but when this api returns, the structure should be filled up, but this is not happening. Are there any formattings to be done before/after calling. can u please tell me if u know anything about this.