I need help making a dialog box for an invalid entry!
2. Add data validation to the application so it won’t do the conversion until the user enters a Fahrenheit temperature between -100 and 212. If the entry is invalid, a dialog box that explains the requirements for a valid entry should be displayed.
3. Add a loop to the code so the user can do a series of calculations without restarting the application. To end the application, the user must enter 999 as the temperature.
Which means I need help making a dialog box!

Please add the link to the lesson.

But if this is for a school assignment or test, then we cannot help as it goes against our guidelines about cheating.

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