private void newBlock_Click(object sender, EventArgs e) { System.Diagnostics.Debug.WriteLine("hello " + comboBox1.SelectedIndex); //List<Transaction> transactions = blockchain.getPendingTransactions(); List <Transaction> transactions = blockchain.gettransactionPool(comboBox1.SelectedIndex, publicKey.Text); //System.Diagnostics.Debug.WriteLine(transactions[0].fee); Block newBlock = new Block(blockchain.GetLastBlock(), transactions, _Form1, publicKey.Text); blockchain.Blocks.Add(newBlock); richTextBox1.Text = blockchain.ToString(); }