eindeutigen Dateinamen ermitteln

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/// <summary>
/// Get a unique filename.
/// </summary>
/// <param name="directory">The directory.</param>
/// <param name="filename">The filename.</param>
/// <returns>a unique filename</returns>
private static string GetUniqueFilename(DirectoryInfo directory, string filename)
{
    if (!File.Exists(directory + filename))
        return filename;
    else
    {
        int counter = 0;
        FileInfo fileInfo = new FileInfo(filename);
        while (File.Exists(directory + filename))
        {
            counter++;
            filename = fileInfo.Name.Replace(fileInfo.Extension, String.Empty) + counter + fileInfo.Extension;
        }
        return filename;
    }
}