Problem Statement
I had created a SharePoint 2010 Web Part which was using the ASP.NET List view. The code compiled fine and was deployed properly. However, when I was trying to add the web part to the Web part page, I was getting the following error:
Unknown server tag ‘asp:ListView’
Resolution
Open the web.config and add the following entry in <Controls>
<controls>
<add tagPrefix=”asp” namespace=”System.Web.UI.WebControls” assembly=”System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35″/>
</controls>
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