How to loop listbox to input text into webbrowser and click button

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C#

VB

hello Good programmers,
please, I have a serious problem that has taken me like a week without any solution.
it is very serious because a company gave me this as what they want and I really need to do this. please I need help.

I want the applocation to populate a listbox, then upon loading the application, it loads the website that requires you input a string and click on a button. now I want to loop the strings from the listbox to input in the site and click the button but u have not seen a way to do this. please, help nw out.

What I have tried:

Webbroswer_complete()
for fr as integer=0 to listbox.items.count - 1
input.into.text(listbox.items(fr).tostring())
input.click.button
next