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Unrecognized tag prefix of device filter 'asp'

Posted on 2013-05-28
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Last Modified: 2013-05-29
Why do these warnings appear? Unrecognized tag prefix of device filter 'asp'

<asp:GridView id="grdWatchList" runat="server"  

    Height="20px"
            Width="600px" Caption="Best Picks List " 
            BorderColor="Black" BorderStyle="Double" BorderWidth="1px"
            BackColor="Azure" AlternatingRowStyle-BackColor="#FFFF66"
            AlternatingRowStyle-BorderStyle="Solid" Font-Names="Arial"
            Font-Size="10pt" AutoGenerateColumns="False"
            DataKeyNames="SymbolID" PageSize="3"
            CaptionAlign="Left" ForeColor="Black"
            >
         
            <Columns> Validation(HTML5): element 'columns' is not supported.

Is documentation available?

Thanks,
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Question by:Dovberman
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4 Comments
 
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Accepted Solution

by:
Miguel Oz earned 1200 total points
ID: 39203094
Check your web.config as per suggestions below:
http://stackoverflow.com/questions/12809653/unrecognized-tag-prefix-or-device-filter-asp-in-vs2012
What kind of project is it? New? web app or site?
0
 

Author Comment

by:Dovberman
ID: 39204011
This is a new web site project.
0
 

Author Comment

by:Dovberman
ID: 39204026
Updating the Controls section of web.config to 4.0 resolved the issue.

Thanks
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Author Closing Comment

by:Dovberman
ID: 39204028
Thank you.
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