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    <p>This question had an original answer that is now over 7 years old. That code is preserved at <a href="https://gist.github.com/i-e-b/2290426" rel="nofollow noreferrer">https://gist.github.com/i-e-b/2290426</a> This old version might work for you if you need to use Windows XP for some reason.</p> <p>A much better answer is at <a href="https://stackoverflow.com/questions/1304/how-to-check-for-file-lock/20623302#20623302">How to check for file lock?</a></p> <p>I've replicated Eric J's answer below (with <code>using</code> statements added, and class &amp; method names to match the old code that was here) Please note that the comments to this answer may be out-of-date.</p> <p>Use like:</p> <pre><code>List&lt;Process&gt; locks = Win32Processes.GetProcessesLockingFile(@"C:\Hello.docx"); </code></pre> <p>Code:</p> <pre><code>using System; using System.Collections.Generic; using System.Diagnostics; using System.Runtime.InteropServices; namespace FileLockInfo { public static class Win32Processes { /// &lt;summary&gt; /// Find out what process(es) have a lock on the specified file. /// &lt;/summary&gt; /// &lt;param name="path"&gt;Path of the file.&lt;/param&gt; /// &lt;returns&gt;Processes locking the file&lt;/returns&gt; /// &lt;remarks&gt;See also: /// http://msdn.microsoft.com/en-us/library/windows/desktop/aa373661(v=vs.85).aspx /// http://wyupdate.googlecode.com/svn-history/r401/trunk/frmFilesInUse.cs (no copyright in code at time of viewing) /// &lt;/remarks&gt; public static List&lt;Process&gt; GetProcessesLockingFile(string path) { uint handle; string key = Guid.NewGuid().ToString(); int res = RmStartSession(out handle, 0, key); if (res != 0) throw new Exception("Could not begin restart session. Unable to determine file locker."); try { const int MORE_DATA = 234; uint pnProcInfoNeeded, pnProcInfo = 0, lpdwRebootReasons = RmRebootReasonNone; string[] resources = {path}; // Just checking on one resource. res = RmRegisterResources(handle, (uint) resources.Length, resources, 0, null, 0, null); if (res != 0) throw new Exception("Could not register resource."); //Note: there's a race condition here -- the first call to RmGetList() returns // the total number of process. However, when we call RmGetList() again to get // the actual processes this number may have increased. res = RmGetList(handle, out pnProcInfoNeeded, ref pnProcInfo, null, ref lpdwRebootReasons); if (res == MORE_DATA) { return EnumerateProcesses(pnProcInfoNeeded, handle, lpdwRebootReasons); } else if (res != 0) throw new Exception("Could not list processes locking resource. Failed to get size of result."); } finally { RmEndSession(handle); } return new List&lt;Process&gt;(); } [StructLayout(LayoutKind.Sequential)] public struct RM_UNIQUE_PROCESS { public int dwProcessId; public System.Runtime.InteropServices.ComTypes.FILETIME ProcessStartTime; } const int RmRebootReasonNone = 0; const int CCH_RM_MAX_APP_NAME = 255; const int CCH_RM_MAX_SVC_NAME = 63; public enum RM_APP_TYPE { RmUnknownApp = 0, RmMainWindow = 1, RmOtherWindow = 2, RmService = 3, RmExplorer = 4, RmConsole = 5, RmCritical = 1000 } [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] public struct RM_PROCESS_INFO { public RM_UNIQUE_PROCESS Process; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCH_RM_MAX_APP_NAME + 1)] public string strAppName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCH_RM_MAX_SVC_NAME + 1)] public string strServiceShortName; public RM_APP_TYPE ApplicationType; public uint AppStatus; public uint TSSessionId; [MarshalAs(UnmanagedType.Bool)] public bool bRestartable; } [DllImport("rstrtmgr.dll", CharSet = CharSet.Unicode)] static extern int RmRegisterResources(uint pSessionHandle, uint nFiles, string[] rgsFilenames, uint nApplications, [In] RM_UNIQUE_PROCESS[] rgApplications, uint nServices, string[] rgsServiceNames); [DllImport("rstrtmgr.dll", CharSet = CharSet.Auto)] static extern int RmStartSession(out uint pSessionHandle, int dwSessionFlags, string strSessionKey); [DllImport("rstrtmgr.dll")] static extern int RmEndSession(uint pSessionHandle); [DllImport("rstrtmgr.dll")] static extern int RmGetList(uint dwSessionHandle, out uint pnProcInfoNeeded, ref uint pnProcInfo, [In, Out] RM_PROCESS_INFO[] rgAffectedApps, ref uint lpdwRebootReasons); private static List&lt;Process&gt; EnumerateProcesses(uint pnProcInfoNeeded, uint handle, uint lpdwRebootReasons) { var processes = new List&lt;Process&gt;(10); // Create an array to store the process results var processInfo = new RM_PROCESS_INFO[pnProcInfoNeeded]; var pnProcInfo = pnProcInfoNeeded; // Get the list var res = RmGetList(handle, out pnProcInfoNeeded, ref pnProcInfo, processInfo, ref lpdwRebootReasons); if (res != 0) throw new Exception("Could not list processes locking resource."); for (int i = 0; i &lt; pnProcInfo; i++) { try { processes.Add(Process.GetProcessById(processInfo[i].Process.dwProcessId)); } catch (ArgumentException) { } // catch the error -- in case the process is no longer running } return processes; } } } </code></pre>
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    1. POUsing C#, how does one figure out what process locked a file?
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    1. COThis works like a charm!
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      1. USSandor Drieënhuizen
    2. COHaha, I like this but it seems to be getting a lock of its own...
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      1. USBoog
    3. COAny idea how to fix this code from acquiring a lock of its own on files?
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