Validierung eines URL

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/// <summary>
    /// Determines whether the specified URL is in a valid format.
    /// </summary>
    /// <param name="Url">URL to validate.</param>
    /// <returns><c>True</c> if the URL is formatted correctly, otherwise <c>False</c>.</returns>
    /// <remarks></remarks>
    public static bool IsUrl(String Url)
    {
      return Regex.IsMatch(Url, @"((https?|ftp|gopher|telnet|file|notes|ms-help):((//)|(\\\\))+[\w\d:#@%/;$()~_?\+-=\\\.&]*)");
    }