How to write in file text more times?
<p>I'm working C#, WPF and has a homework about game multiple-choice which has a application, make a list questions and answers for user. I want to write in file.text not only one time.</p>

<p>I used this event:</p>

<p><img src="https://i.stack.imgur.com/xhbjC.gif" alt=""></p>

<p>This code:</p>

<pre><code>private void Button_Click(object sender, RoutedEventArgs e)
{
    using( StreamWriter File = new StreamWriter(@"C:\Users\Admin\Documents\Visual Studio 2013\Projects\ĐỒ ÁN 2\ĐỒ ÁN 2\bin\Debug\Bo1.txt"))
    {
        File.WriteLine("dsCauHoi*Câu hỏi thêm*"+ txbcauhoi.Text.ToString()+ "*"+txbA.Text.ToString()+ "*"+ txbB.Text.ToString()+ "*" +txbC.Text.ToString() +"*"+ txbD.Text+ "*"+ txbAD.Text.ToString()+"/n");
    }
    MessageBox.Show("Cảm ơn bạn đã đóng góp ý kiến");
    this.Close();
}
</code></pre>

<p>But it allow writing one times.</p>