title: Find what Elements were added by Javascript
body: <p>I have got an ASP-Site, which enables the user to Add Label-Elements. I don’t know how many Labels where added or which ID they have. I know only, they will be within the Panel pnl_Added. After the user has added all his labels, he pushes a Send-Button for Update.</p>
  
  <p>So, now I am at my Server, awaiting this postback, but I don’t know where, when and how to find out, which Elements were Added to pnl_Added. Can somebody help me?</p>
  
  <p>I have tried something like that:</p>
  
  <pre><code>protected void Page_Load(object sender, EventArgs e)
  {
  [...]
  for (int i = 0; i &lt; pnl_Added.Controls.Count; i++)
          {
              [...]
          }
  [...]
  }
  </code></pre>
  
  <p>But I think it is too late because of the loaded ViewState? Is that possible?</p>
  
  <p>I am working with VS 2013, ASP c#, with the .Net Framework 4.</p>