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Error 1 Unable to copy file "obj\x86\Debug\WindowsFormsApplication3.exe" to "bin\Debug\WindowsFormsApplication3.exe". The process cannot access the file 'bin\Debug\WindowsFormsApplication3.exe' because it is being used by another process. c:\Windows\Microsoft.NET\Framework\v4.0.30319\Micr osoft.Common.targets 2868