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    <p>Here is some code I found: </p> <pre><code>using System; // has DateTime class using System.Collections.Generic; // has the Dictionary class using System.DirectoryServices; // has all the LDAP classes such as DirectoryEntry using ActiveDs; // has the IADsLargeInteger class // Get the root entry DirectoryEntry rootDSE = new DirectoryEntry("LDAP://RootDSE"); string configurationNamingContext = (string)rootDSE.Properties["configurationNamingContext"].Value; string defaultNamingContext = (string)rootDSE.Properties["defaultNamingContext"].Value; // Get all the domain controllers // Get all the domain controllers DirectoryEntry deConfig = new DirectoryEntry("LDAP://" + configurationNamingContext); DirectorySearcher dsConfig = new DirectorySearcher(deConfig); dsConfig.Filter = "(objectClass=nTDSDSA)"; foreach (SearchResult srDomains in dsConfig.FindAll()) { DirectoryEntry deDomain = srDomains.GetDirectoryEntry(); if (deDomain != null) { string dnsHostName = deDomain.Parent.Properties["DNSHostName"].Value.ToString(); // Get all the users for that domain } } // Get all the users for that domain DirectoryEntry deUsers = new DirectoryEntry("LDAP://" + dnsHostName + "/" + defaultNamingContext); DirectorySearcher dsUsers = new DirectorySearcher(deUsers); dsUsers.Filter = "(&amp;(objectCategory=person)(objectClass=user))"; foreach (SearchResult srUsers in dsUsers.FindAll()) { DirectoryEntry deUser = srUsers.GetDirectoryEntry(); if (deUser != null) { // Get the distinguishedName and lastLogon for each user // Save the most recent logon for each user in a Dictionary object } } //Create Dictionary Dictionary&lt;string, Int64&gt; lastLogons = new Dictionary&lt;string, Int64&gt;(); // Get the distinguishedName and lastLogon for each user string distinguishedName = deUser.Properties["distinguishedName"].Value.ToString(); Int64 lastLogonThisServer = new Int64(); if (deUser.Properties["lastLogon"].Value != null) { IADsLargeInteger lgInt = (IADsLargeInteger)deUser.Properties["lastLogon"].Value; lastLogonThisServer = ((long)lgInt.HighPart &lt;&lt; 32) + lgInt.LowPart; } // Save the most recent logon for each user in a Dictionary object if (lastLogons.ContainsKey(distinguishedName)) { if (lastLogons[distinguishedName] &lt; lastLogonThisServer) { lastLogons[distinguishedName] = lastLogonThisServer; } } else { lastLogons.Add(distinguishedName, lastLogonThisServer); } //Get the time // Convert the long integer to a DateTime value string readableLastLogon = DateTime.FromFileTime(lastLogonThisServer).ToString(); </code></pre> <p>Here is the website where all of this code came from. The developer explained the code in detail. <a href="http://www.codeproject.com/Articles/19181/Find-LastLogon-Across-All-Windows-Domain-Controlle" rel="nofollow">http://www.codeproject.com/Articles/19181/Find-LastLogon-Across-All-Windows-Domain-Controlle</a></p>
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    1. POHow to find what user last logged onto a given computer through Active Directory in C#?
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    1. USJLott
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    1. COThat's last logon *time*. I said I already accomplished that and I need to find the user that logged in at that time. I don't think this approach would work for last user logged on because there doesn't seem to be a property in DirectoryEntry for that.
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      1. USBaga Jr.
 

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