URL validation function or method using C#

Use following function to validate URL using C#.....

public static bool IsUrl(string Url)
{
    string strRegex = "^(https?://)"
            + "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?" //user@
            + @"(([0-9]{1,3}\.){3}[0-9]{1,3}" // IP- 199.194.52.184
            + "|" // allows either IP or domain
            + @"([0-9a-z_!~*'()-]+\.)*" // tertiary domain(s)- www.
            + @"([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\." // second level domain
            + "[a-z]{2,6})" // first level domain- .com or .museum
            + "(:[0-9]{1,4})?" // port number- :80
            + "((/?)|" // a slash isn't required if there is no file name
            + "(/[0-9a-z_!~*'().;?:@&=+$,%#-]+)+/?)$";
   
    Regex re = new Regex(strRegex);
    if (re.IsMatch(Url))
        return (true);
    else
        return (false);
}