Cleaning up Default GridView Markup

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I saw an interesting question today from a customer related to some of the default markup for a GridView. The following code:

<asp:GridView ID="GridView1" runat="server">
</asp:GridView>

Will generate this markup in the web page:

<table cellspacing="0" rules="all" border="1" id="GridView1" style="border-collapse:collapse;">

</table>

Adding:

 CellSpacing="-1" GridLines="None"

Will clean the markup considerably generating this in the web page:

<table border="0" id="GridView1">

There currently is no way to get rid of the final Border="0" but the above technique does clean up the table considerably.