Once file extracted you can delete the zip file using
File.Delete(zipfilePath)
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Hey, it’s crazy behavior when you have assign ALT key shortcut and when you run application and don't she underlined letters.
It’s due to your operating system settings.
Check below thing.
Right click the desktop, go to Properties, then click the Appearance tab, and then click the Effects button. You should see the setting for "Hide underlined letters for keyboard navigation until I press the Alt Key"
If its checked out then you need to press Alt key to see underlined letters. Else it will show you.
Hope it would be helpful..for me it most.