title: Navigate between pages in contentplaceholder using UpdatePanel
body: <p>I have one masterpage:</p>
  
  <pre><code>&lt;asp:UpdatePanel ID="upPanel" runat="server"&gt;
      &lt;ContentTemplate&gt;
           &lt;asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"&gt;
           &lt;/asp:ContentPlaceHolder&gt;
      &lt;/ContentTemplate&gt;
  &lt;/asp:UpdatePanel&gt;
  </code></pre>
  
  <p>And also I have 3 pages with navigation buttons Next and Back, something like this:</p>
  
  <pre><code>&lt;asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"&gt;
  &lt;/asp:Content&gt;
  &lt;asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"&gt;
      &lt;div&gt;
          &lt;asp:Label ID="lbl1" runat="server"&gt;Second PAGE&lt;/asp:Label&gt;
          &lt;asp:Button ID="btnBack" runat="server" /&gt;
          &lt;asp:Button ID="btnNext" runat="server" /&gt;
      &lt;/div&gt;   
  &lt;/asp:Content&gt;
  </code></pre>
  
  <p>Could you advise me, please, how to navigate between this pages without loading all page and only overload content?</p>