c# - How to open link address containing HEX without converting HEX to digit? -

i have links containing hex values, i'm opening them code below:

var webrequest = webrequest.create(url);              try             {                  webresponse webresponse = webrequest.getresponse();                  webresponse.close();             } 

but when webrequest created, links converting uri loosing special hex values.
example:
original link: /generic=http%3a%2f%2fnym1.ib.adnxs.com%2fab%3fenc%3drmexlckt4t
actual link: /generic=http%3a/nym1.ib.adnxs.com/ab%3fenc%3drmexlckt4t

%2f converted /
possible force opening of original link, or maybe way open such links?

thanks!