How to Call Rest Web service in WP8

Question

hi

 

i am new in Rest Web service.

I am developing windows phone 8 application.

I have following things 

server => 'http://webchannel.co/demo/einsurer/api/rtainsurer/'
http_user' =>xxxxxxxx
http_pass => xxxxxxx
api_key => xxxxxx
http_auth=> basic
test for method : xyzmethod
parameter: lang=>'en'

 

now i want to call this web service using Webclient or Httpwebrequest 

how call this using this two class.

 i already try but it give result like "Remote server not found"

i also know how to check this type API in Soup UI

 

please help me through or any link as possible as. 

 

thanks