Basic binding for a WCF service client using username and password.

gistfile1.xml

<client>
    <endpoint address="YOUR_SERVICE_URL"
              binding="netTcpBinding"
              bindingConfiguration="NetTcpBinding_YOUR_REFERENCED_SERVICE_INTERFACE"
              contract="YOUR_REFERENCED_SERVICE.YOUR_REFERENCED_SERVICE_INTERFACE"
              name="NetTcpBinding_YOUR_REFERENCED_SERVICE_INTERFACE">
        <identity>
            <dns value="dev_cert_2"/>
            <certificate encodedValue="..." />
        </identity>
    </endpoint>
</client>