If you are using the File.CopyTo() method in .NET and getting an error message saying that the file is being used by another process, it could be because the file is already open in another program or process on your system.

To resolve this error, you can try the following:

  1. Close any programs or processes that may be using the file.
  2. Use the File.Open() method to open the file with the FileShare.None flag, which will prevent other programs or processes from accessing the file while it is open. Then, use the File.CopyTo() method to copy the file, and close the file when you are finished.
Copy codeusing (FileStream sourceStream = File.Open(sourceFile, FileMode.Open, FileAccess.Read, FileShare.None))
    using (FileStream destinationStream = File.Create(destinationFile))
  1. If the file is being used by a network resource, you may need to check the network connection or try the copy operation again later when the resource is available.
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