You need to know what your LDAP path is for your user - if you do not know, you can download my LDAP BeaverTail browser .

, LDAP- , : LDAP Manager:
DirectoryEntry deUser = new DirectoryEntry("LDAP://cn=John Doe,cn=Users,dc=YourCorp,dc=com");
if(deUser != null)
{
// check if the manager property is set - it could be NULL (no manager defined)
if(deUser.Properties["manager"] != null)
{
string managerDN = deUser.Properties["manager"][0].ToString();
}
}
Manager " " (DN) - LDAP - DirectoryEntry.