prime numbers c#

Question

I\'m new to C#. And I would like to program something like, displaying the prime numbers in a listbox if user will input any integer in the textbox. (that means, if they wri

Answer 1

You'll need to know:

• How to read user input from a Windows application
• How to generate prime numbers within a range
• How to write output in the way that you want

I strongly suggest that you separate these tasks. Once you've got each of them working separately, you can put them together. (Marc suggests writing a console app for the prime number section - that's a good suggestion if you don't want to get into unit testing yet. If you've used unit testing in other languages, it's reasonably easy to get up and running with NUnit. A console app will certainly be quicker to get started with though.)

In theory, for a potentially long-running task (e.g. the user inputs 1000000 as the first number) you should usually use a background thread to keep the UI responsive. However, I would ignore that to start with. Be aware that while you're computing the primes, your application will appear to be "hung", but get it working at all first. Once you're confident with the simple version, you can look at BackgroundWorker and the like if you're feeling adventurous.