Instruction

void инструкцияButton_Click(object sender, EventArgs e)
        {
            string instr = "";
            string appPath = AppDomain.CurrentDomain.BaseDirectory;
            string[] instruction = File.ReadAllLines
                (Path.Combine(@appPath, "Instruction.txt"));
            foreach (string s in instruction)
                instr += s + "\n";
            MessageBox.Show(instr, "Инструкция", MessageBoxButtons.OK,
                            MessageBoxIcon.Information);
        }