怎么搜索ACTIVE DIRECTORY组底下的成员?

[xmchw]

看以下的例子.是我搜索ACTIVE DIRECTORY 组(DI-IT-ITOA)底下成员的方法:
public static void GetAllOU()

{

DirectoryEntry entry = new DirectoryEntry("LDAP://yamani.com.cn");
DirectorySearcher mySearcher = new DirectorySearcher(entry);
// mySearcher.Filter = ("( &(objectClass=user) (objectCategory=Person)(SAMAccountName=cheng.hw)) "); //这个查询成员是对的

mySearcher.Filter = ("( & (objectCategory=group)(objectClass=group)(cn=ITOA))");
foreach(SearchResult resEnt in mySearcher.FindAll()) //这个查询组查不到
{
// resEnt.
MessageBox.Show(resEnt.GetDirectoryEntry().Name.ToString ());
MessageBox.Show(resEnt.GetDirectoryEntry().Parent.Name.ToString());
// resEnt.GetDirectoryEntry().
}//end foreach

}//end GetAllOU
查询不出来.请问各位要怎么查询呢?

[icezs]

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