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after copying the file to another destination i want to delete the file from origin.
I am unable to do so as file is used by another process

File.Copy(FullPath, strErrorFile, true);

find out which process is using the file

How to find out which handle or DLL is using a file
Open Process Explorer, running as administrator.
Enter the keyboard shortcut Ctrl+F. Altenatively, click the “Find” menu and select “Find a Handle or DLL”.
A search dialog box will open.
Type in the name of the locked file or other file of interest.

(there are other ways of doing that - Process Explorer from SysInternals *may* help)

if it's your own process, you may need a delay between the copy and delete or some other method of flushing/forcing your process to let go of the file
You will need to investigate what's going on. To do so, start with reading my past answer on this topic: how to compress the error 'it is already used by another process' in[^].


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