problem with active directory code: object not set to an instance of an object

[EDN Admin]

<span style="font-size:small <span style="font-size:small I have a code section in my current active directory program in which it gives the error in the title above at the line:
If results.Path = "" Then from below<span style="font-size:small code:
<pre class="prettyprint lang-vb Dim results As SearchResult = Nothing
currentADObject = New DirectoryEntry("LDAP://OU=090_Paint Lick EL,OU=Staff,DC=garrard,DC=ketsds,DC=net", "", "", AuthenticationTypes.Secure)
Dim ADFind As DirectorySearcher = New DirectorySearcher(currentADObject)
If username <> "" Then
ADFind.Filter = "(&(objectCategory=user)(cn=" + username + "))"
Else
Exit Select
End If
results = ADFind.FindOne
If results.Path = "" Then
MsgBox("empty results")
End If[/code]
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