testing svc web service

First you have to create test project in visual studio and add service reference, than you will be able to create test like this:

      
        [Test]
        public void BusinessWebserviceServiceTest01()
        {
            BusinessWebservice.ServiceClient client= new ServiceClient();
            Debug.Write(client.getOpenInvoicesCount(1006469, 1, 1292071, "0"));
        }