title: How to display an ASPX in another ASPX's DIV dynamically at runtime?
body: <p>Here is what I am trying to do in ASP.NET:</p>
  
  <p>Create one page called Main.aspx. This page has a DIV and a buttons.</p>
  
  <p>The browser loads Main.aspx. Then when I click the button, I want to load page Page99.aspx into the DIV in Main.aspx dynamically, but without Main.aspx requiring a postback.</p>
  
  <p>So, Main.aspx loads once, and thereafter all the content displayed in Main.aspx will come from different .aspx pages.</p>
  
  <p><strong>Ps.</strong> I'm looking for a solution as above, but not using frames.</p>
  
  <p><strong>UPDATE 1</strong>
  I should mention that Page99 is not a simple HTML page. It will contain Web controls.</p>