Example of using NBitcoin in C#

NBitcoinService.cs

using NBitcoin;
using NBitcoin.Protocol;
using NBitcoin.Protocol.Behaviors;

// Create a private key for the sender
var privateKey = new Key();

// Get the public address from the private key
var fromAddress = privateKey.PubKey.GetAddress(Network.TestNet);
Console.WriteLine("Sender address: " + fromAddress);

// Create a new transaction
var tx = new Transaction();

// Create a recipient address
var toAddress = new BitcoinPubKeyAddress("mwCwTceJvYV27KXBc3NJZys6CjsgsoeHmf");

// Specify the amount to send
var amount = new Money(0.01m, MoneyUnit.BTC);

// Add an output to the transaction to send the specified amount to the recipient address
tx.Outputs.Add(amount, toAddress);

// Get the previous transaction where the sender's address received some bitcoins
var previousTx = new uint256("d5d27987d2a3dfc724e359870c6644b40e497bdc0589a033220fe15429d88599");

// Get the index of the output of the previous transaction that the sender wants to spend
var outputIndex = 0;

// Add an input to the transaction to spend the bitcoins from the previous transaction
tx.Inputs.Add(new TxIn(previousTx, outputIndex));

// Sign the transaction using the private key of the sender
tx.Sign(privateKey, false);

// Create a node to connect to the Bitcoin network
var node = new Node(Network.TestNet);

// Start the node and connect to the network
node.Behaviors.Add(new TrackerBehavior());
node.Connect();

// Broadcast the transaction to the network
node.SendMessage(new InvPayload(tx));

Console.WriteLine("Transaction broadcasted to the network with txid: " + tx.GetHash());