by Christian Fredh
24. February 2010 02:57
In SharePoint 2007 you had to modify the web.config file, manually or with a feature, to enable the ScriptManager, ListView and other features in ASP.NET 3.5.
SharePoint 2010 is built on ASP.NET 3.5 so it should just work. However, the namespace for the ListView control is not mapped in the web.config or in the SharePoint Project Item templates by default. If you do not register the the namespace you will see the "Unknown server tag 'asp:ListView'" error message if you for instance use it in a web part:
To fix it add this line to the <controls>-section under <system.web> and <pages>:
<add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
Or register the namespace in the .ascx or .aspx file:
<%@ Register Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI.WebControls" TagPrefix="asp" %>
And it should work:
Hopefully they will add both before RTM.
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