Mar 03, 2014 08:18 AM|smirnov|LINK
Let's check #2. I suppose, you've copied the complete code and if it does not generate any error then it means that the filter is correct and the user has been found.
Try to modify it as follows
SearchResult result = mySearcher.FindOne();
Make sure that the group value is correct. For debug purposes you might try to output all groups using Console.Write or Response.Write to see what is inside.
Also you can try to test it using some ldap tools, such as LDAP Browser http://www.ldapbrowser.com/download.htm