http://blogs.msdn.com/webdevelopertips/archive/2008/10/19/tip-15-did-you-know-how-to-use-tracing-with-asp-net-ajax.aspxIf you are using ASP.NET Ajax and you are having problems with a web page one quick and dirty way to debug it is to add tracing statements. You do this by using the &quot;Sys.Debug.trace&quot; function. For example: 1: &lt; script language =&quot;javascript&quot;en-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/webdevelopertips/archive/2008/10/19/tip-15-did-you-know-how-to-use-tracing-with-asp-net-ajax.aspx#9011190Wed, 22 Oct 2008 18:26:06 GMT91d46819-8472-40ad-a661-2c78acb4018c:9011190Dew Drop - October 22, 2008 | Alvin Ashcraft's Morning Dew<p>PingBack from <a rel="nofollow" target="_new" href="http://www.alvinashcraft.com/2008/10/22/dew-drop-october-22-2008/">http://www.alvinashcraft.com/2008/10/22/dew-drop-october-22-2008/</a></p>