Connecting and Calling Web Reference in VS 2008 for Smart Device Project

Hi, I cannot call the namespace, and any code from added Web Reference to my project in VS2008 for smart devices (windows mobile 5.0). I have the Web Reference (not service reference) retrieved from Microsoft Dynamics NAV 2015 and I want to integrate this system with my project in C#. I was trying many solutions to call this Web Service in code. For example: - tried to enter the following: WebService ws = new WebService(); - tried to use "using [login to view URL]; - tried to create WSDL file separately. I always have the same error: "The type or namespace name 'WS' does not exist in the namespace 'xxx' (are you missing an assembly reference?)" I am looking someone, who works with Dynamics NAV and .NET.