When I delete a Web Application from Central Administration, I cannot create a Web Application at the same address.  I also see that the IIS folder does not disappear:


I try to delete the folder by hand, but the following file is locked:


It give an error:

The process cannot access the file

‘C:\inetpub\wwwroot\wss\VirtualDirectories\mySite443\_app_bin\Microsoft.SP.WorkflowServices.ApplicationPages.dll’ because it is being used by another process

SharePoint Solution:

Some people suggest iisreset, but the process is actually locked by PowerShell with SP extensions.

Close all PowerShell and delete the file.

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