namespace wcf.win.client.srv
{
    [ServiceContract]
    interface IService
    {
        [OperationContract]
        void GetProjectsList(string user_name);
    }

public void GetProjectsList(string user_name)
        {
.....
        }
}

System.ServiceModel.Channels.Binding b = new NetTcpBinding();
            ChannelFactory<srv.IService> f = new ChannelFactory<srv.IService>(b);
            srv.IService srv = f.CreateChannel(new EndpointAddress("net.tcp://localhost:8856/Projects"));

            srv.GetProjectsList("sss");

ServiceHost sh=new ServiceHost(typeof(srv.Service));
                sh.Open();

<configuration>
    <system.serviceModel>
        <bindings>
            <wsHttpBinding>
                <binding name="wsHttpBinding_Projects" transactionFlow="true">
                </binding>
            </wsHttpBinding>
            <netTcpBinding>
                <binding name="netTcpBinding_Projects" transactionFlow="true"></binding>
            </netTcpBinding>
        </bindings>
        <services>
            <clear/>
            <service  name="wcf.win.client.srv.Service">
                <host>
                    <baseAddresses>
                        <add baseAddress="net.tcp://localhost:8856/Projects"/>
                    </baseAddresses>
                </host>
                <endpoint
                    bindingConfiguration="netTcpBinding_Projects"
                    address=""
                    contract="wcf.win.client.srv.IService"
                    binding="netTcpBinding" ></endpoint>
            </service>
        </services>
        <behaviors>
            <serviceBehaviors>
                <clear/>
                <!--<behavior name="ProjectsBehavior">
                    <serviceMetadata httpGetEnabled="true"/>
                </behavior>-->
            </serviceBehaviors>
            <endpointBehaviors>
                <clear/>
            </endpointBehaviors>
        </behaviors>
    </system.serviceModel>
</configuration>