> "Jesper Ravn" <jesper_r...@hotmail.com> wrote in message
> news:uLpj9wfYKHA.1648@TK2MSFTNGP05.phx.gbl...
>> Hello

>> I have created a small application in VB.net where I query AD
>> information.
>> In the user section I can retrive LastLogon, by query all DC.
>> My main concern though, is the performance when I list 3000-5000+ users
>> in a listview.
>> What is your experience with LastLogon and performance where the
>> enviroment host mutiple Domain Controlleres in branch office
>> Should I go down that road or should I pull the LastLogon value from a
>> basic inventory (Logon script + SQL).
>> Im already using the LastlogontimeStamp to determine old users and
>> computers, but the lastlogon attribute, are more up to date and are often
>> requeted by helpdesk staff.

> 3000-5000 users is not a lot, unless you are binding to the user objects.
> I use ADO to query the DC's for all users in bulk (you must turn on
> paging). The number of DC's and the speed of the links is more important.
> I retain the largest lastLogon value for each user in a dictionary object.
> Again, 5000 entries is not a lot, and a dictionary object should be more
> efficient than an array. The query for lastLogon should be separate from
> the query for other attributes that are replicated.

> A VBScript example is linked here:

> http://www.rlmueller.net/Last%20Logon.htm

> I've done similar in classic VB. I added a reference to the Microsoft
> Scripting Runtime (scrrun.dll) for the dictionary object, and another for
> Microsoft ActiveX Data Objects. I haven't done it in VB.NET.