Check if a file is in use by trying to open it exclusively

FileIsInUse.cs

static class FileHelper
{
	public static bool FileInUse(string path)
	{
		try
		{
			using var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None);
			return false;
		}
		catch (IOException)
		{
			// If file does not exist, it's not in use
			return File.Exists(path);
		}
	}
}