public static void Main()
var text = "GuidePlayer_20201119_29.htm?Skin=infocaption5&Project=infocaption5&OfflinePlayer=true";
var enc1 = HttpUtility.HtmlEncode(text);
var enc2 = HttpUtility.HtmlDecode(text);
var enc3 = HttpUtility.UrlEncode(text);
var enc4 = HttpUtility.UrlDecode(text);