The requested operation cannot be performed on a file with a user-mapped section open

Question

Whenever I tried to copy 4 files into my bin folder  after stopping the main service  I am getting an error with one file  TexteDll   The error is   Cannot copy TexteDll  The requested operation cannot be performed on a file  with a user-mapped section open   It may be due to some system locking  Or perhaps another process is using this DLL  When I googled  I found that rebooting the system may resolve this   Can anybody suggest a cause or solution for this  I inspected the properties of TexteDll  general  version  security  etc   Everything appears normal

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in my case deleted the obj folder in project root and rebuild project solved my problem

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It has been pointed out in 2016 by Andrew Cuthbert that git diff locks files as well until you quit out of it  That won t be the case with Git 2 23  Q3 2019   See commit 3aef54e  11 Jul 2019  by Johannes Schindelin  dscho    Merged by Junio C Hamano -- gitster -- in commit d9beb46  25 Jul 2019   diff  munmap   file contents before running external diff   When running an external diff from  say  a diff tool  it is safe to assume that we want to write the files in question  On Windows  that means that there cannot be any other process holding an open handle to said files  or even just a mapped region  So let s make sure that git diff itself is not holding any open handle to the files in question  In fact  we will just release the file pair right away  as the external diff uses the files we just wrote  so we do not need to hold the file contents in memory anymore  This fixes git-for-windows 1315   Running  quot git diff quot  man  while allowing external diff in a state with unmerged paths used to segfault  which has been corrected with Git 2 30  Q1 2021   See commit d668518  commit 2469593  06 Nov 2020  by Jinoh Kang  iamahuman    Merged by Junio C Hamano -- gitster -- in commit d5e3532  21 Nov 2020   diff  allow passing NULL to diff free filespec data   Signed-off-by  Jinoh Kang Signed-off-by  Junio C Hamano   Commit 3aef54e8b8   quot diff  munmap   file contents before running external diff quot   Git v2 22 1  introduced calls to diff free filespec data in run external diff  which may pass NULL pointers  Fix this and prevent any such bugs in the future by making diff free filespec data NULL  a no-op  Fixes  3aef54e8b8   quot diff  munmap   file contents before running external diff quot

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In my case I had to kill a hanging MSBuild exe process that was locking the file  it was there even after I closed Visual Studio

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Deleting the obj folder and rebuilding worked for me

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If you re using profilers like AQ Time  these may also be locking the file  The solution in this case would be to restart the profiler or simply unload load the assembly in question from the profiler   For AQ Time I noticed that it s releasing the file after some time  but I can t for the life of me tell what that timeout is   Seems to be random

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The solution for me was to close out of all instances of VS and to kill any hanging devenv exe processes

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Close visual studio  delete bin   debug release folder  and start visual studio project again  that fixed my problem

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My issue was also solved by sifting through the Process Explorer  However  the process I had to kill was the MySQL Notifier exe that was still running after closing all VS and SQL applications

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Are you running any Anti-virus software  It s possible that the AV software  or some other piece of software  was reading the file using the file mapping APIs which caused the problem

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None of the above solved this issue   Someone had one project in my solution set to use x64 CPU in the build configuration  Changing it to Any CPU caused the build to use a new folder  I still don t know what process had  has  a lock on that file

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Others have already established that this error is due to another application having a lock on the file  Just wanted to point out that git diff locks files as well until you quit out of it  That s what caused this in my case

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Happened to me after I have changed the project target CPU from  Any CPU  to  X64  and then back to  Any CPU    Solved it by deleting the Obj folder  for beginners  don t worry about deleting the obj folder  it will be recreated again in the next compile

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I had this same issue   I removed dll from temp folder  remove read only access  and restarted machine and got it working

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I am a developer and do not like apps injected to Registery like Unlocker  I used SysInternals Process Explorer  which process locked my dll Find  gt  Find Handle or Dll  Ctrl-F  and killed the process

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In my case it was the Explorer that was locking the DLL that was been compiled in the Debug folder    Strange  isn t it   I found out using a tool called Unlocker   Had to delete with Unlocker  even when it was saying that there was no lock over the file  and I couldn t delete the folder until I didn t delete that single file     After that it compiled   EDIT   I found out why in my case this was happening  I had the DLL opened in a text editor inside Visual Studio

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I fixed the issue as below   Restart machine Delete bin and obj folders from respective project path  Open visual studio Clean and build the solution   There you go issue resolved

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In my case  I just close all instance and copy my root application folder and paste it in different location then open solution in VS it works

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I was seeing these errors when building Dot Net applications with Ant   In my case it was our corporate backup software  the Symantec DLO Agent  Stopping it and excluding the directory in my antivirus software and closing Visual Studio seems to work

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I encountered this error and it turned out the issue was FxCop was running against my project   I closed FxCop and then I could compile again

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I had the same problem  Restart did not work for me  There was a process called VBSCompiler was running in task manager  I had to end the process to fix this error

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The solution for me was to restart the computer

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Sometimes when you double click on a warning about the referenced assembly version mismatch between two or more projects you forget to close the assembly view window and it stays there among other tabs    so you end up with the assembly being locked by VS itself and it took me quite a lot of time to figure that out     Be careful with the power VS provides    Another dummy scenario  Sometimes simply deleting the whole obj folder or just the file warned as the locked one helps out with this crappy error

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I had same problem and in my case it appeared that existing output file was locked by other application   You can check which application is locking your output file with OpenedFilesView  http   www nirsoft net utils opened files view html

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I had the same issue  How I resolved it was    Open  Task Manager   End task  Explorer exe  Click  File  --  Create new task -- Type in  explorer exe  --  OK Clean my project and it works

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I had this error caused by a  more  vs file in question left running in another console  Oops

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None of the solutions posted here worked for me  It was devenv exe  Visual Studio  locking the file  but if I restarted it  it would re-lock it   Bizarrely  Windows wouldn t let me Delete the files  to Recycle Bin   but Shift Delete  permanent delete  worked

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If it is a web application deleting files in Temporary ASP NET Files folder could be a solution

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Close the Visual Studio and Run it as administrator  It s fixed my problem

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close all documents on VS and try to rebuild again  If it doesn t work restart VS  This problem is related to lock of DLL files

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I also got same error today  I have resolved this issue by re-building the project

[windows] The requested operation cannot be performed on a file with a user-mapped section open

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