Database connections : My program wont launch, I'm getting an error I don't know how to fix. Please advise

I've googled the error


Error 1:
Severity	Code	Description	Project	File	Line	Suppression State
Error		Unable to copy file "obj\Debug\KarateStock.exe" to "bin\Debug\KarateStock.exe". The process cannot access the file 'bin\Debug\KarateStock.exe' because it is being used by another process.	KarateStock			


Error 2:
Severity	Code	Description	Project	File	Line	Suppression State
Error		Could not copy "obj\Debug\KarateStock.exe" to "bin\Debug\KarateStock.exe". Exceeded retry count of 10. Failed. The file is locked by: "KarateStock (6744), KarateStock (5932), KarateStock (1196)"	KarateStock