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    <p>I'm afraid you have to resort to using P/Invoke. There's an example how to do it at <a href="http://www.pinvoke.net/default.aspx/advapi32.GetTokenInformation" rel="noreferrer">pinvoke.net</a> (please see the bottom of the page):</p> <pre><code>Result = GetTokenInformation(WindowsIdentity.GetCurrent().Token, TOKEN_INFORMATION_CLASS.TokenSessionId , TokenInformation , TokenInfLength , out TokenInfLength ); </code></pre> <p>Please note that I changed the example by altering just one line, I replaced <code>TOKEN_INFORMATION_CLASS.TokenUser</code> with <code>TOKEN_INFORMATION_CLASS.TokenSessionId</code> which is exactly what you need.</p> <p>Hope this helps.</p> <p><strong>Update: Here's the working (at least on my machine) code:</strong></p> <pre><code>using System; using System.Runtime.InteropServices; using System.Security.Principal; namespace LinqTest { public class ClsLookupAccountName { public const uint SE_GROUP_LOGON_ID = 0xC0000000; // from winnt.h public const int TokenGroups = 2; // from TOKEN_INFORMATION_CLASS enum TOKEN_INFORMATION_CLASS { TokenUser = 1, TokenGroups, TokenPrivileges, TokenOwner, TokenPrimaryGroup, TokenDefaultDacl, TokenSource, TokenType, TokenImpersonationLevel, TokenStatistics, TokenRestrictedSids, TokenSessionId, TokenGroupsAndPrivileges, TokenSessionReference, TokenSandBoxInert, TokenAuditPolicy, TokenOrigin } [StructLayout(LayoutKind.Sequential)] public struct SID_AND_ATTRIBUTES { public IntPtr Sid; public uint Attributes; } [StructLayout(LayoutKind.Sequential)] public struct TOKEN_GROUPS { public int GroupCount; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)] public SID_AND_ATTRIBUTES[] Groups; }; // Using IntPtr for pSID instead of Byte[] [DllImport("advapi32", CharSet = CharSet.Auto, SetLastError = true)] static extern bool ConvertSidToStringSid(IntPtr pSID, out IntPtr ptrSid); [DllImport("kernel32.dll")] static extern IntPtr LocalFree(IntPtr hMem); [DllImport("advapi32.dll", SetLastError = true)] static extern bool GetTokenInformation( IntPtr TokenHandle, TOKEN_INFORMATION_CLASS TokenInformationClass, IntPtr TokenInformation, int TokenInformationLength, out int ReturnLength); public static string GetLogonId() { int TokenInfLength = 0; // first call gets lenght of TokenInformation bool Result = GetTokenInformation(WindowsIdentity.GetCurrent().Token, TOKEN_INFORMATION_CLASS.TokenGroups, IntPtr.Zero, TokenInfLength, out TokenInfLength); IntPtr TokenInformation = Marshal.AllocHGlobal(TokenInfLength); Result = GetTokenInformation(WindowsIdentity.GetCurrent().Token, TOKEN_INFORMATION_CLASS.TokenGroups, TokenInformation, TokenInfLength, out TokenInfLength); if (!Result) { Marshal.FreeHGlobal(TokenInformation); return string.Empty; } string retVal = string.Empty; TOKEN_GROUPS groups = (TOKEN_GROUPS)Marshal.PtrToStructure(TokenInformation, typeof(TOKEN_GROUPS)); int sidAndAttrSize = Marshal.SizeOf(new SID_AND_ATTRIBUTES()); for (int i = 0; i &lt; groups.GroupCount; i++) { SID_AND_ATTRIBUTES sidAndAttributes = (SID_AND_ATTRIBUTES)Marshal.PtrToStructure( new IntPtr(TokenInformation.ToInt64() + i * sidAndAttrSize + IntPtr.Size), typeof(SID_AND_ATTRIBUTES)); if ((sidAndAttributes.Attributes &amp; SE_GROUP_LOGON_ID) == SE_GROUP_LOGON_ID) { IntPtr pstr = IntPtr.Zero; ConvertSidToStringSid(sidAndAttributes.Sid, out pstr); retVal = Marshal.PtrToStringAuto(pstr); LocalFree(pstr); break; } } Marshal.FreeHGlobal(TokenInformation); return retVal; } } } </code></pre> <p>N.B. I tested it on my x64 machine, so please pay close attention on <code>TokenInformation.ToInt64()</code> piece of code, maybe you should replace it with <code>TokenInformation.ToInt32()</code></p>
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    1. POHow to get the logon SID in C#
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    1. USIgor Korkhov
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    1. CODoesn't work unfortunately. It returns nothing. According to this (http://msdn.microsoft.com/en-us/library/aa379626%28VS.85%29.aspx), it only works on terminal server, so it might not be the session id I need.
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    2. COI added another version of the code, it works on my machine. Please feel free to ask me if something is not clear.
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    3. COThanks! This one works perfectly. I used TokenLogonSid instead of TokenGroups, but that only works for Windows Vista and 7.
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