Starting WinForms application doesn't work

Question

I created a WinForms application project. The simplest one. When I hit ctrl + F5 nothing happens, and Visual Studio freezes. And sometimes I get this error: (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.) But often output window is absolutely empty.

When I start it in debugging (F5) mode it works. It never happened to me before.

I checked Task Manager and it seems that the applicatin process is already started when the project is opened in VS and when I try to run the application another process is created. So, in that moment I have two identical processes. Maybe there lies the problem, but not sure. How to solve this?

You need to provide much more information for anybody to help you. — Wai Ha Lee, Nov 12 '15 at 14:57
Are you running an antivirus l? Maybe Avast? Try to disable it before running the program — Zorgatone, Nov 12 '15 at 15:18
Wooow!!!! It worked!!! Thanks a lot! This was bugging me for days! — Archiorg, Nov 12 '15 at 15:21
@Archiorg : Could you please post an answer to the question ? Or you could choose one of the answers to resolve the question as solved, so that it will be useful for future users. I have answered it too. :-) — Whirl Mind, Nov 12 '15 at 15:44
@SethKitchen : For this question, there is no more information that can be given than has already been. — Whirl Mind, Nov 12 '15 at 15:45
@WhirlMind Much has been added since I last looked at the problem — Seth Kitchen, Nov 12 '15 at 15:46

score 3 · Accepted Answer · answered Nov 12 '15 at 16:50

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Thanks to Zorgatone's answer (which is in the comments), in my case, the solution was to disable Avast antivirus.

answered Nov 12 '15 at 16:50

Archiorg

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score 0 · Answer 2 · answered Nov 12 '15 at 14:55

Possibly a registry file is missing? Have you cleaned registry's recently? Try start it in Compatibility settings to one lower than your current OP should temp fix it. The task manager process not being there is because it has services that run alongside it, identify and shut the related ones.

score 0 · Answer 3 · answered Nov 12 '15 at 14:59

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Your system files may by corrupted. Try to run sfc https://support.microsoft.com/en-us/kb/929833

answered Nov 12 '15 at 14:59

Siewier

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score 0 · Answer 4 · answered Nov 12 '15 at 15:02

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From the toolbars, open the output console and watch while the libraries are being loaded and check when the problem occures. Also paste the output log.

answered Nov 12 '15 at 15:02

Gnqz

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score 0 · Answer 5 · answered Nov 12 '15 at 15:43

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I have faced this problem of "being used" etc. In my case, yes, the project was already running or the exe was running. I just had to close or end the one that was running (or close Visual Studio) and start again. I found it strange too. I guess, in the debug mode, VS kinda tries to write the exe in a temporary way to run it and if there is an exe already present in the debug folder, this error is thrown.

answered Nov 12 '15 at 15:43

Whirl Mind

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I tried that, but with no succes. The process was still running. – Archiorg Nov 12 '15 at 16:49

Starting WinForms application doesn't work

5 Answers5