'What is this eror?

Severity Code Description Project File Line Category Suppression State Error Unable to copy file "obj\Debug\36.exe" to "bin\Debug\36.exe". The process cannot access the file 'bin\Debug\36.exe' because it is being used by another process. 36



Solution 1:[1]

Open TaskManager on windows, in Processes Tab find your app and select End. so Rebuild your project.

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Source: Stack Overflow

Solution Source
Solution 1 thisisnabi