One of the cool things about ASP.NET 4.0 is the Query Extender and the ability to search within DataContext without using WHERE clause, writing extensive code etc., It works on the new set of namespace i.e. ?System.Web.UI.WebControls.Expressions? namespace. I am trying to put up an extensive sample using QueryExtender in the next post, but for this post, I wanted to share an error that you might hit when trying to implement the Query Extender control with Search Expression, Range Expression etc., This error is specific to the Visual Studio 2010 Beta 1 build that was released to public. If you look at the MSDN sample for Query Extender it ports a markup like below for Query Extender <asp:QueryExtender runat="server" TargetControlID...(read more)
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