Multiple Set-Cookies in httpwebrequest Header

I try to login one website using C# HTTPWebRequest class, i can login but not able to read multiple set-cookies in header

When the server responds with multiple "Set-Cookie:"-headers, only the first one becomes available to me in header

Web Response in HTTPWebRequest

    Set-Cookie: x-main=Yvi4723B?Nk5zuPPCZ0?66eGEI5kVnOM; path=/; domain=.xxx.com;
expires=Wed May 25 13:20:05 2011 GMT
How to get all "Set-Cookie:" in header using HTTPWebRequest class??

Web Response in HTTP Live Header

    Set-Cookie: crstoken=Yvi4723B?Nk5zuPPCZ0?66eGEI5kVnOM; path=/; domain=.xxxx.com; expires=Wed May 25 13:20:05 2011 GMT

    Set-Cookie: Sessionid=sfdsffsdf bsfdfdsfdsfs; path=/; domain=.xxx.com; expires=Wed May 25 13:20:05 2011 GMT

   I need to get crstoken and Sessionid from Set-Cookie.

I am looking forward your reply,

Thanks in advance.......