2 'File being used by another process' questions

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The app I've inherited maintenance for (VB .Net 2.0 Windows Service) reads various text files.

 

It was writtin using the Microsoft.VisualBasic.FileIO.TextFieldParser class.

 

When the code gets here:

Using parser As New TextFieldParser(currentFile)

it may throw an exception if the file hasn't been completely written. (It's a folder monitor service)

 

So, my two questions:

For testing purposes, what's a quick/easy way to set a file as in use to trigger the exception?

I'd like to check for in use, and then wait for a second or two, try again, and if it's still not available then fail. How can I check if a file is in use?

 

 

 

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