Demo Code

 public static bool IsValidURL(string strURL)
{
    string regExPattern = @"^^(ht|f)tp(s?)\:\/\/[0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*(:(0-9)*)*(\/?)([a-zA-Z0-9\-\.\?\,\'\/\\\+&%\$#_=]*)?$";
    Regex re = new Regex(regExPattern);
    return re.IsMatch(strURL);
}

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Demo Quote

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