help with the SaveFileDialog()

Question

I am a newbie to programming, but i am starting to get the hang of building forms. I know how to get a savefiledialog() to show, but what i haven't been able to figure out is how to use it. i will be using StreamWriter() to write to a txt file. just some simple output. How do i get the savefiledialog to save the info that i am trying to write to the file? can someone give me an example or code snippet?