Using NBitcoin, how can I generate Electrum old type HD wallet from private key/seed?

[monwazchh]

Hello, I have been using NBitcoin for my projects for a long time and I am very satisfied.

However, I am currently facing a problem.
I am creating an “old” type HD wallet in the Electrum application from a private key or a seed (actually both are the same).
I want to do the same in C#. I tried this with NBitcoin with many different methods but unfortunately I couldn't succeed.
I wonder, can I create Electrum Old HD wallet using NBitcoin?

Note I have tried many classes such as Key Path, Mnemonic, ExtKey but unfortunately I could not generate the same addresses.

Honestly, I have studied Electrum's source code as much as I can understand. The only thing I noticed is that the private key/seed is encrypted with sha256 an extra 100k times and then addresses are generated. I tried this in C# but again it generates different addresses.

Can anyone help me with this?