lakario

public static string GetUniqueFileName(string filePath, char directorySeparatorChar = '\\')
{
    if (String.IsNullOrWhiteSpace(filePath))
        return filePath;

    const string iteratorRegex = @"(-(?<iterator>[0-9]+)|\((?<iterator>[0-9]+)\))$";

    var fileName = Path.GetFileNameWithoutExtension(filePath) ?? string.Empty;
    var directoryName = Path.GetDirectoryName(filePath);
    var fileExtension = Path.GetExtension(filePath) ?? "";