title: How to generate url for href in aspx page
body: <p>How does one generate a <code>URL</code> in a master page's <code>ASPX</code> page so that the reference works everywhere across the app?</p>
  
  <p>Here is an example from a menu in a master page:</p>
  
  <pre><code>&lt;a href="Admin/AddVendor.aspx"&gt;Add Vendor&lt;/a&gt;
  </code></pre>
  
  <p>The problem is that if I leave the <code>URL</code> as it is on the master page, then when someone is already on a page that resides in the Admin folder, this <code>URL</code> no longer works. 
  I need to path the <code>URL</code> from the root every time, but forget how to do this in <code>WebForms</code>.</p>