How to access the content of the webpage after login

Question

 Hi guys,

we have a network device which can accessible through http: like http:\\IPADDRESS

on the home page we need to enter the username and password . after login to the webpage we can see the details of device like uptime,serialno,software version.

I need to get these details using c#... I tried with httprequest class but i am able to retrive the login page only...

Could any one help me on this..