Active Directory in C#.NET

[dmj07]

Hi,

I need some help with my Active Directory coding in C#. All I am trying to do is quey the active directory on my server to return information about a user such as first name, surname etc. Here is my code at the moment:

 
DirectoryEntry de = new DirectoryEntry("LDAP://ServersIPAddress"); 
 
DirectorySearcher srch = new DirectorySearcher(de);
 
srch.Filter = "(&(objectClass=user)(|(cn=PersonsUsername)))";
 
SearchResult result = srch.FindOne();
 
DirectoryEntry directoryObject = new DirectoryEntry();
 
directoryObject = result.GetDirectoryEntry();
 
 

With this code the program stops at the directoryObject line saying:

Object reference not set to an instance of an object

Any ideas please?

Many thanks in advance.