title: Using inline expression with SessionParameter fails
body: <p>This works as fine in my ASP.NET page's SqlDataSource:</p>
  
  <pre><code>&lt;asp:SessionParameter Name="FromTimestamp" SessionField="fromtime" DefaultValue="2/22/2012" /&gt;
  </code></pre>
  
  <p>Why does this produces error: <code>Conversion failed when converting date and/or time from character string.</code></p>
  
  <pre><code>&lt;asp:SessionParameter Name="FromTimestamp" SessionField="fromtime" DefaultValue='&lt;%=DateTime.Now.ToShortDateString()%&gt;' /&gt;
  </code></pre>