Unable to copy a file from obj Debug to bin Debug

Question

I have a project in C  and I get this error every time I try to compile the project       Unable to copy file  obj Debug Project1 exe  to  bin Debug Project1 exe   The process cannot access the file  bin Debug Project1 exe  because it is being used by another process     So I have to close the process from the task manager  My project is only one form and there is no multi-threading    What is the solution  without restarting VS or killing the process

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Solution1    Close the project   Delete the bin folder  Open the project  Build the project    Solution2   Add the following code in pre-build event   attrib -r   OutDir        s  This command line code will remove the ready-only attribute of  bin  folder  Now visual studio can easily delete and copy new dlls

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The real problem isn t the error you re getting  it s that the application isn t cleaning up after itself   It s either holding on to references  not freeing resources  or something else that s causing the process to not end when it s being told to close  Fix up that issue and this problem will resolve itself  We can t really help you with that unless you post your code  and at this point  if you need help with that  you should start a new question

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Rename the assembly to a different name to solve this issue

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in my case problem was in web config  I just removed  lt system web gt       lt hostingEnvironment shadowCopyBinAssemblies  quot false quot    gt     lt  system web gt

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After seeing a similar error in visual studios 2012 out of no where  I have found that that going to the root folder of the project and right clicking on it I unchecked read only and this error went away  Apparently TFS sometimes will made a folder read only  Hopefully this will help anyone with a similar issue  Thanks

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This happened to me at VS 2010 and Win 7   Case      I can not Rebuild with Debug Configuration manager  but I can rebuild with Release Configuration manager     What I have tried    Check my account type at control panel - user account --  My Account is Administrator      Set the bin folder not read only      Add security at bin folder to Everyone      stop the iis server      Stop antivirus  check ridiculous running program using task manager and ProcessExplorer run VS as administrator   If All that way is still not working   Then  the last way to try    close solution close visual studio start - shutdown press power button to turn on the computer login to your account which has administrator previlege at user type reopen solution rebuild that way working  All people call this way as Reset Computer

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I had the same problem  so I solved in this way  Step 1  Close Vb  Step 2  Just go to your project directory and delete Bin folder  Step 3  Open Vb

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Run Visual Studio as Administrator

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I had to go into windows explorer and delete the bin debug folder as well as the obj debug folders   Then I cleaned  amp  rebuilt the project

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I too had the same issue  I resolved it  Closed my VS  then in Task Manager  End  tasks like Microsoft VisualStudio WCF Tools  MSBuild exe  Then open VS and clean and rebuild

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Disable any Anti Ransomware  like MalwareBytes  running  then the problem should be solved

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I struggeled with this since years   I finally downloaded LockHunter to find out who locked the file  In my case it was MBAM   Once I added my project s directory to MBAMs exclusion list  I didn t have this problem anymore

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Well i have the same problem  my way to fix it was to stop and disable the  application experience  service in Windows

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This is happening because  yourProjectName  exe process is not closing after finishing debugging   There are two solutions to this problem    Every time you make change to application  Go to Task Manager -  Processes -   yourProjectName  exe  end this process  You have to end this process every time you make changes to system  Add a exit button in your application to exit window and add these line to click event  System Diagnostics Process GetCurrentProcess   Kill    Application Exit

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I found that ending all msbuild exe tasks  in Task Manager  fixed the issue with VS2012

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after day with search and build and rebuild i found that you just need to turn off turn on the visual studio its look like it catch the service in different thread

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If this error was encountered  you can proceed as the following   End the msbuild exe task End the explorer exe task Run the explorer exe task again

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We recently experienced this on a WinPhone 8 project  in VS 2012 Update 2    Inexplicably  the cause was using the Tuple type  Removing the code that used a Tuple the problem went away  Add the code back the problem returned

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Udpate  Since the time I was first posting this  answer   I tend to another explanation to the problem  The issue since than happened more and more often outside of Visual Studio also - while trying to copy an  exe file from one folder to another  While in the first place Windows did not allow to copy    an  exe file  it was first asking me for administrative rights but refused to copy it afterwards anyway  it still showed up in the explorer  But after a while - without any further action taken  it disappeared magically  Just like the problem in the question always seems to solve itself after a while  So i assume  the problem is more related to a delayed deletion of the project output file and less a buggy VS  I apologize for any unjustified suspicion       This gives the search for a solution a complete different direction  I guess  Did find that link and will update on any progress    https   superuser com questions 234569 windows-7-delayed-file-delete                                                                            This is a known bug in VS  I discovered it very often - mostly in VS2010  with without SP1   Several  solutions  are recommended  Some of them  which kind of helped for me     Delete the  suo file in your project dir  Eventually need to create your whole solution from scratch   Close any Windows Form Designers may remain open   Use a prebuild script  which deletes the target from the output dir  Disable the VS hosting process    None of these really fixes the bug  But it may brings the VS back to a usable state - until a true solution is provided by MS  if ever will    http   social msdn microsoft com Forums en vsdebug thread cea5e4b2-5b33-453c-bffb-8da9f1a1fa4a  http   social msdn microsoft com Forums en vbide thread cd12f3c7-de96-4353-adce-23975e30933f

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If you look in the obj directory  and you don t see your  exe  it s possible that Avast  or other antivirus is deleting it   I would actually see the  exe show up and then disappear   As soon as I turned off Avast   problem solved    VS2010 throwing  quot Could not copy the file  quot obj x86 Debug  file  exe quot  because it was not found  quot

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No matter what the cause of this problem is  the only working solution for me is the following  Go to Your-Project-Properties - gt  Application tab first tab  - gt  Change the Assembly name  This way your app creates a new assembly file each time you change the assembly name  Finally  after you finish to develop  you can delete all those extra assembly files and just keep the last one  main one   Non of the other solutions worked for me  except this one

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Close your project Delete bin folder   i find it work

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This should work   Go to your project properties   Inside Build Events  under Pre-build event command line  add these two lines of code   if exist    TargetPath  locked  del    TargetPath  locked  if exist    TargetPath   if not exist    TargetPath  locked  move    TargetPath      TargetPath  locked

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Mine got solved by    Clean solution Close all processes depending on VS  Current instances    Rebuild

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This will Sound crazy  when ever i build the project the error will be displayed and the avast antivirus will show it as malicious attempt and the project does not run i just simply disable my antivirus and build my solution again the missing  EXE file has been Created and the project has been successfully executed   Or you can try this   Visual Studio build fails  unable to copy exe-file from obj debug to bin debug

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I solved this by killing XDesProc which had a handle on the DLL it couldn t delete

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Before rebuild the solution  clear the project  stop the IIS and open the  bin  folder property  Uncheck the Read-only Attribute in general tab then rebuild

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I can confirm this bug exists in VS 2012 Update 2 also   My work-around is to    Clean Solution  and do nothing else  Close all open documents files in the solution Exit VS 2012 Run VS 2012 Build Solution   I don t know if this is relevant or not  but my project uses  Linked  in class files from other projects - it s a Silverlight 5 project and the only way to share a class that is  NET and SL compatible is to link the files   Something to consider     look for linked files across projects in a single solution

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I had same problem  after read your answers   went to Task Manager and searched for app exe because i believe maybe it doesn t close   And found it   select it and do END TASK  my problem solved

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for me it was the antivirus  Just add visual studio project or entire parent folder to Antivirus exclusion list or you can also add file extension as exclusion and this method worked for me in visual studio 2010 2012

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Not a direct answer to your question    One scenario when this can come is listed below -  If your application is under Debugging process - say by  Attach to Process  debugging  this error may come

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My Visual studio 2019 suddenly stops and restarts and then when i run project this error comes   I resolve this issue by going into my project folder and delete bin and obj folder Then clean and rebuild my project  This resolve my issue

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This solution worked for me  Go to Build - gt  Configuration Manager - gt  Active solution platform - gt  Select x64  you may have to create new  and finally set the Platform to x64 and close

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A very simple solution is to open the Task Manager  CTRL   ALT   DELETE   go to Processes tab and search by name the processes with your project name that are still running  Kill all the processes and go on

[c#] Unable to copy a file from obj\Debug to bin\Debug

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