Thank you, dharmendr. So then under <style> one would define like so:
.highlight { background-color:burlywood }
Correct? One can do it without using a script, though, using the RowStyle-CssClass property of GridView:
<style>
.highlight:hover { background-color:burlywood}
<style>
...
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" RowStyle-CssClass="highlight"
...