This maight seems a little bit silly but since I coudlnt find any free working contact importer for asp.net I actually decide to try combining PHP and C#.
I found that PHP openinviter works perfectly and imports contacts from hotmail, gmail, aol, facebook, myspace ....
following this tutorial http://www.codeproject.com/KB/cs/IntegrationTips.aspx I called PHP script from my asp.net page and got everything I needed.
Download openinviter from http://openinviter.com/download.php and edit example.php to adjust it for your needs
For example, just replace echo contents; with print_r($contacts); in the last line of code in example.php and call this script from asp.net as described in the IntegrationTips tutorial. You will have to pass this values to your request
string strUrl = @"http://www.yoursite.com/OpenInviterFolder/example.php";
string strRequest = @"step=get_contacts&provider_box=hotmail&email_box=your_email@hotmail.com&password_box=your_password";
this is a list of providers from which you can inport contact using this gimnastics style of coding :)
Email contact importer
"abv">Abv
"aol">AOL
"apropo">Apropo
"atlas">Atlas
"aussiemail">Aussiemail
"azet">Azet
"bigstring">Bigstring
"bordermail">Bordermail
"canoe">Canoe
"care2">Care2
"clevergo">Clevergo
"doramail">Doramail
"evite">Evite
"fastmail">FastMail
"fm5">5Fm
"freemail">Freemail
"gawab">Gawab
"gmail">GMail
"gmx_net">GMX.net
"graffiti">Grafitti
"hotmail">Live/Hotmail
"hushmail">Hushmail
"inbox">Inbox.com
"india">India
"indiatimes">IndiaTimes
"inet">Inet
"interia">Interia
"katamail">KataMail
"kids">Kids
"libero">Libero
"linkedin">LinkedIn
"lycos">Lycos
"mail2world">Mail2World
"mail_com">Mail.com
"mail_in">Mail.in
"mail_ru">Mail.ru
"meta">Meta
"mynet">Mynet.com
"netaddress">Netaddress
"nz11">Nz11
"o2">O2
"operamail">OperaMail
"pochta">Pochta
"popstarmail">Popstarmail
"rambler">Rambler
"rediff">Rediff
"sapo">Sapo.pt
"techemail">Techemail
"terra">Terra
"uk2">Uk2
"virgilio">Virgilio
"walla">Walla
"web_de">Web.de
"wpl">Wp.pt
"yahoo">Yahoo!
"yandex">Yandex
"youtube">YouTube
"zapak">Zapakmail
Social Networks
"badoo">Badoo
"bebo">Bebo
"bookcrossing">Bookcrossing
"brazencareerist">Brazencareerist
"cyworld">Cyworld
"eons">Eons
"facebook">Facebook
"faces">Faces
"famiva">Famiva
"fdcareer">Fdcareer
"flickr">Flickr
"flingr">Flingr
"flixster">Flixster
"friendfeed">Friendfeed
"friendster">Friendster
"hi5">Hi5
"hyves">Hyves
"kincafe">Kincafe
"konnects">Konnects
"koolro">Koolro
"lastfm">Last.fm
"livejournal">Livejournal
"lovento">Lovento
"meinvz">Meinvz
"mevio">Mevio
"motortopia">Motortopia
"multiply">Multiply
"mycatspace">Mycatspace
"mydogspace">Mydogspace
"myspace">MySpace
"netlog">NetLog
"ning">Ning
"orkut">Orkut
"perfspot">Perfspot
"plaxo">Plaxo
"plazes">Plazes
"plurk">Plurk
"skyrock">Skyrock
"tagged">Tagged
"twitter">Twitter
"vimeo">Vimeo
"vkontakte">Vkontakte
"xanga">Xanga
"xing">Xing
"xuqa">Xuqa
Hope this will help others with the same problem
cheers
Tomas