To get Ajax working on an ASP.Net website

I couldn't get Ajax working on this one particular ASP.Net website and after a lengthy search I found the fix here http://geekswithblogs.net/influent1/archive/2007/05/16/112544.aspx.  I had to add this to the web.config:
<system.web> 
    <pages> 
      <controls> 
        <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
        <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
      </controls> 
    </pages> 
</system.web>

Add a field to a Visual Studio 2005 Report Services Report

In the Datasets area right-click on a DataSource and select Add.

Add Field

Enter in the Name of the new field and the Database field or Calculated field.

Add Field Dialog

Then we need to update the tie between the Dataset and SQL Server by clicking on the Data tab and selecting our Dataset in the dropdown and updating the query.