Ken Cox
Posts 170
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Depending on the type of project you used to create the Web, Visual Studio may not include all the references that you require for the C# version of the code on Page 119. The symptom is the following error message:
CS1935: Could not find an implementation of the query pattern for source type 'System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement>'. 'Where' not found. Are you missing a reference to 'System.Core.dll' or a using directive for 'System.Linq'?
The fix is to add the following reference at the top of the page:
<%@ Import Namespace="System.Linq" %>
An alternate fix is to ensure that the web.config file references all of the namespaces by including this in the <system.web> section:
<pages>
<namespaces>
<clear/>
<add namespace="System"/>
<add namespace="System.Collections"/>
<add namespace="System.Collections.Generic"/>
<add namespace="System.Collections.Specialized"/>
<add namespace="System.Configuration"/>
<add namespace="System.Text"/>
<add namespace="System.Text.RegularExpressions"/>
<add namespace="System.Linq"/>
<add namespace="System.Xml.Linq"/>
<add namespace="System.Web"/>
<add namespace="System.Web.Caching"/>
<add namespace="System.Web.SessionState"/>
<add namespace="System.Web.Security"/>
<add namespace="System.Web.Profile"/>
<add namespace="System.Web.UI"/>
<add namespace="System.Web.UI.WebControls"/>
<add namespace="System.Web.UI.WebControls.WebParts"/>
<add namespace="System.Web.UI.HtmlControls"/>
</namespaces>
<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>
Ken
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