public Form1()
{
InitializeComponent();
ServiceHost host = new ServiceHost(typeof(Service1));
host.Open();

}

ChannelFactory factory = new ChannelFactory(new WSHttpBinding(), new EndpointAddress("http://localhost:8731/Design_Time_Addresses/WindowsFormsHost/Service1/"));
IService1 proxy = factory.CreateChannel();
proxy.DoWork();

[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
ServiceHost host = new ServiceHost(typeof(Service1));
host.Open();

Application.Run(new Form1());
}