How to send SOL in Solana NET SDK?

Question

The documentation shows how to make a transfer from one wallet to another. In one account.

// Initialize the rpc client and a wallet
var rpcClient = ClientFactory.GetClient(Cluster.TestNet);
var wallet = new Wallet();
// Get the source account
var fromAccount = wallet.GetAccount(0);
// Get the destination account
var toAccount = wallet.GetAccount(1);
// Get a recent block hash to include in the transaction
var blockHash = rpcClient.GetRecentBlockHash();

// Initialize a transaction builder and chain as many instructions as you want before building the message
var tx = new TransactionBuilder().
        SetRecentBlockHash(blockHash.Result.Value.Blockhash).
        SetFeePayer(fromAccount).
        AddInstruction(MemoProgram.NewMemo(fromAccount, "Hello from Sol.Net :)")).
        AddInstruction(SystemProgram.Transfer(fromAccount, toAccount.GetPublicKey, 100000)).
        Build(fromAccount);

var firstSig = rpcClient.SendTransaction(tx);

How to make a transfer to another account? Do I need to know the private key of the account to which I will transfer?

Answer 1

Your example has all of the pieces you need. To transfer to another account, you need to create a transaction (using TransactionBuilder), and specifically add a SystemProgram.Transfer instruction to your transaction. Also, in your example, you're sending from fromAccount, which has the private key, to toAccount.PublicKey. You're using the PublicKey of toAccount, so no need for the private key of the recipient.

Note that the example appears to be incorrect, so you should base your code from this example instead: https://github.com/bmresearch/Solnet/blob/8369ac166ed90a7e6b07060178ed70745bd97bc3/src/Solnet.Examples/TransactionBuilderExample.cs#L22