C# Copy File But Error because it is being used by another process

Error: because it is being used by another process.

I get this error when using File.Copy(fileSource, fileTarget, true);

Not exactly the solution from stackoverflow, but this is the solution that I used:

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try { File.Copy(fileSource, fileTarget, true); } catch (IOException e) { if (e.Message.Contains("in use")) { Process p = new Process(); p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.FileName = "cmd.exe"; p.StartInfo.Arguments = "/C copy \"" + fileSource + "\" \"" + fileTarget + "\""; p.Start(); Console.WriteLine(p.StandardOutput.ReadToEnd()); p.WaitForExit(); p.Close(); } }

I don't know why this works though. Before I had to go to the physical server, rename the file, then copy. I still do not know why the files are locked. Nothing should be running it. This is not a problem with all applications running on the server.

Reference

https://stackoverflow.com/questions/6167136/how-to-copy-a-file-while-it-is-being-used-by-another-process