Hello,
I saw some examples using NBitcoin to generate Keys and addresses with it.

I have some questions related to the use of it (for the moment I'm just a simple user of Electrum to receive/send bitcoin, but I want to use bitcoin as a payment option on my site without passing by a third party like bitpay):
- are the key / address generated linked to a wallet ?
- is there a way to "link" new addresses to a wallet ?
- Electrum use a password when I import and send payment. Why NBitcoin doesn't ask for a password when generating a key ?

Thanks ,