Untitled

how to read an html file and replace with our characters
Hi XXX,
Thanks for joing in the Club, your ClubcardNo is : XXXXX

Thanks

String s = s.Replace("XXXXX", "23453");

var str=@"Hi XXX,
                Thanks for joing in the Club, your ClubcardNo is : XXXXX

                Thanks";

str.Replace("XXXXX","23453").Replace("XXX","Kiran");

string output = Regex.Replace(input, "XXX", "Kiran");