at the top of your c# code put using
then the name of the webservice , just like you would add any other namespace
ex.
using System.Data;
using System.Data.SqlClient;
using net.virtualearth.dev;
I use virtualearth webservice for Bing's geolocate service, and this is how you include it it code ,
This is assuming you have already added the reference to it in your project, which I think you were trying to show a picture of , but you blacked out everything
EDIT:
To Add a webservice to c# project
Right Click Project -> Add Service Reference
Click Advanced then Enter URL , if there is a webservice found it will show up
Click Add Reference