title: ASP.net Dynamically adding controls on Button press. Postback issue
body: <p>I have a user control which contains several buttons, depending on the button pressed a different control is added to the page (lets say button 1 adds a TextBox, button2 adds a label).</p>
  
  <p>I have code along the lines of:</p>
  
  <pre><code>protected void but1_click(object sender, EventArgs e)  
  {  
      TextBox tb = new TextBox();  
      tb.ID = "tb1";  
      paramsCtrlDiv.Controls.Add(tb);  
  }  
  
  protected void but2_click(object sender, EventArgs e)  
  {  
      Label lb = new Label();  
      lb.ID = "lb1";  
      paramsCtrlDiv.Controls.Add(lb);  
  }  
  </code></pre>
  
  <p>I then have a third button (button3) to get all controls on the page and their values. (Assume each button is only clicked once for this example).</p>
  
  <p>My problem is when button3 is pressed the paramsCtrlDiv.controls array doesn't contain the controls that have been added. I know I need to add these controls at Page_Load time on each postback. My issue is as I don't know exactly what controls the user has added I don't know what I want to add a Page_Load (there could be a text box, then label, just a label or just a tb), I can't control what the user presses.</p>
  
  <p>I know I could store everything in the session but I'm not sure this is an elegant solution. There can also be several instances of this control on different tabs so each one has to correctly maintain it's own control collection</p>