How to check if url is valid in C# ?

	public bool IsUrlValid(string url)
	{
	string pattern =
	@"^(http|https|ftp|)\://|[a-zA-Z0-9\-\.]+\.[a-zA-Z](:[a-zA-Z0-9]*)?/?([a-zA-Z0-9\-\._\?\,\'/\\\+&%\$#\=~])*[^\.\,\)\(\s]$";
	Regex reg = new Regex(pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);
	return reg.IsMatch(url);
	}

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