DirectorySearcher: Problem with receiving Account Name (the slash maybe the reason)

Hi!

I do have a problem while retrieving the AccountName of Members of a Active
Directory-Group.

I get the members with the DirectorySearcher (of the
System.DirectoryServices namespace).
It all works well with member-entries like:
"CN=blablabla,OU=Users,OU=xxx,OU=xx,DC=xx,DC=xxxxxx,DC=com"
or
"CN=lastname,firstname info&X
moreinfo-A,OU=Users,OU=xxx,OU=xx,DC=xx,DC=xxxxxxx,DC=com"

but not with:

"CN=lastname,firstname xxx/xxx
moreinfo-B,OU=Users,OU=bib,OU=xx,DC=xx,DC=xxxxxxx,DC=com"

I suppose the slash between "xxx/xxx" produces the error.

I this a bug, any ideas? I can not change the AD-entries for the users....

thanks in advance