<asp:GridView ID="gvProjectList" runat="server"
OnRowCreated="gvProjectList_RowCreated">
<AlternatingRowStyle BackColor="#f5f5f5" />
</asp:GridView>

protected void gvProjectList_RowCreated(object sender, GridViewRowEventArgs e)
{
e.Row.Attributes.Add("onmouseover", "currentcolor=this.style.backgroundColor;this.style.backgroundColor='#eaeaea';");//這是鼠標移到某行時改變某行的背景
e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=currentcolor;");//鼠標移走時恢復
}

<script src="jquery-1.5.2.min.js" type="text/javascript"></script>

<style type="text/css">
.even {
background:#F5F5F5;
}
.odd {
background:#FFFFFF;
}
.over{
background:#CDE6FF;
}
.tr_chouse {
background:#6AB1FF;
}
</style>

<script type="text/javascript">
$(document).ready(function(){
$(".gridview tr:odd").addClass("odd"); //奇數行設定為 "odd" 樣式
$(".gridview tr:even").addClass("even"); //偶數行設定為 "even" 樣式
$(".gridview tr").mouseover(function(){$(this).addClass("over");}) //當 mouseover 時加入 "over" 樣式
.mouseout(function(){$(this).removeClass("over");}) //當 mouseout 時移除 "over" 樣式
.click(function(){$(this).toggleClass("tr_chouse");}) //當 click 加入或移除 "tr_chouse" 樣式，實現數據列選取
});
</script>

<script type="text/javascript">
$(function(){ $(".maingrid_text tr:even").addClass("even"); $(".maingrid_text tr:odd").addClass("odd");
$(".maingrid_text tr").hover(function(){$(this).addClass("table_hover")},function(){$(this).removeClass("table_hover")});
});
function EndRequestHandler(){
$(function(){ $(".maingrid_text tr:even").addClass("even"); $(".maingrid_text tr:odd").addClass("odd");
$(".maingrid_text tr").hover(function(){$(this).addClass("table_hover")},function(){$(this).removeClass("table_hover")});
});
}
function reload(){Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);}
$(document).ready(function() { reload(); })
</script>