How to: Determine if a File Exists in Visual Basic
You can use the FileExists method to determine whether or not a specified file exists.
If the application does not have sufficient permissions to read the specified file, the FileExists method returns False regardless of the existence of path; the method does not throw an exception.
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To determine if a file exists
Use the My.Computer.FileSystem.FileExists method, supplying the path, to determine whether or not the specified file exists. The following example checks to see whether or not the file Check.txt exists and supplies the information in a message box.