CreateTransaction(sender: "0", recipient: NodeId, amount: 1); in C# Implementation

Dear Sir,
In C# project for Blockchain...

In CreateTransaction(sender: "0", recipient: NodeId, amount: 1);
1. why the sender is "0" ??
Also after running http://localhost:12345/transactions/new{ "Amount":123, "Recipient":"ebeabf5cc1d54abdbca5a8fe9493b479", "Sender":"31de2e0ef1cb4937830fcfd5d2b3b24f" } nothing happens also after http://localhost:12345/mine amount in transaction is not seen in the browser The following lines
2. are seen and amount is always "1" why ???
Also Transactions vanish after you restart the machine or project...
3. How to maintain the transactions continuously???

{"chain":[{"Index":0,"Timestamp":"2021-09-30T10:52:20.0890196Z","Transactions":[],"Proof":100,"PreviousHash":"1"},{"Index":1,"Timestamp":"2021-09-30T10:55:07.1326461Z","Transactions":[{"Amount":1,"Recipient":"b43a22a573e6430499975c6c67b7894e","Sender":"0"}],"Proof":14342,"PreviousHash":"9ad382b9de9fd575600e33c993228eb894dbb246725eb224a22c5936b7b26e8a"},{"Index":2,"Timestamp":"2021-09-30T10:57:59.0589783Z","Transactions":[{"Amount":1,"Recipient":"b43a22a573e6430499975c6c67b7894e","Sender":"0"}],"Proof":95333,"PreviousHash":"14393b81cd59fd96ce79538640c606bb3eb0a9ac87615b0a20cf483812ac41d9"},{"Index":3,"Timestamp":"2021-09-30T12:20:12.0325329Z","Transactions":[{"Amount":1,"Recipient":"b43a22a573e6430499975c6c67b7894e","Sender":"0"}],"Proof":32512,"PreviousHash":"3d6a5af0f8d75eb1d99f151a0926e7af61e3ff8c49245f6e3a6c5748209340e9"},{"Index":4,"Timestamp":"2021-09-30T12:20:27.2176191Z","Transactions":[{"Amount":1,"Recipient":"b43a22a573e6430499975c6c67b7894e","Sender":"0"}],"Proof":101085,"PreviousHash":"1930e04fd3a53824babadf9267aa8bbccf45ff2b64a61b68aed6540b8ea08150"}],"length":5}

with regards
Ganesh