Take a look at
this[
^] (read through all the responses to get the full details).
Do you know how I found that? Yep, that's right I Googled for '
c# dynamic tooltip' and that should be your numero uno option when you hit a problem. You might want to do it anyway because some of the other hits might give you some ideas for other parts of your code.
In short, google first then ask here with specific problems, show the code that you have tried and fully describe any problems with it, error messages etc.
Good luck! :)