title: Increment number every time button is click
body: <p>I want to increase an <code>int</code> variable <code>i</code> whenever I click on a button. But what I get is only <code>int</code> value of <code>1</code> and it doesn't increase anymore.</p>
  <p>Here is my code:</p>
  <pre><code>private int i;
  
  protected void btnStart_Click(object sender, EventArgs e)
  {
      i++;
  
      lblStart.Text = i.ToString();
  }
  </code></pre>