client.ClientCredentials.UserName.UserName = "myUserName";
client.ClientCredentials.UserName.Password = "myPassword";
string anything = client.getValue(@"anyParam..");

<basicHttpBinding>
    <binding name="ServiceNameHereServiceBinding" >
        <security mode="TransportCredentialOnly">
            <transport clientCredentialType="Basic" proxyCredentialType="None"
                    realm="">
            </transport>
        </security>
    </binding>
</basicHttpBinding>