DataList的ItemDataBound不能用

本来想做鼠标经过此行变色，在DataGrid上可以，但在DataList上没反应，查看源代码连<tr onmouseover="c=this.style.backgroundColor;this.style.backgroundColor='#cccccc'"......都没看见，只有<tr>，说明没获取到，下面是源码：datalist.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;public partial class dataList : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.Page.IsPostBack)
        {
            this.BinderToDataList();
        }
    }
    private void BinderToDataList()
    {
        SqlConnection conn = DB.CreateCon();
        conn.Open();
        SqlDataAdapter sda = new SqlDataAdapter();
        sda.SelectCommand = new SqlCommand("select * from Employees", conn);
        DataSet ds = new DataSet();
        sda.Fill(ds, "emp");
        this.DataList1.DataKeyField = "EmployeeID";
        this.DataList1.DataSource = ds.Tables["emp"];
        this.DataList1.DataBind();
    }
    protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName == "select")
        {
            this.DataList1.SelectedIndex = e.Item.ItemIndex;
            this.BinderToDataList();
        }
        if (e.CommandName == "back")
        {
            this.DataList1.SelectedIndex = -1;
            this.BinderToDataList();
        }
    }
    protected void DataList1_EditCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName == "edit")
        {
            this.DataList1.EditItemIndex = e.Item.ItemIndex;
            this.BinderToDataList();
        }
    }
    protected void DataList1_CancelCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName == "cancel")
        {
            this.DataList1.EditItemIndex = -1;
            this.BinderToDataList();
        }
    }
    protected void DataList1_UpdateCommand(object source, DataListCommandEventArgs e)
    {
        if (e.CommandName == "update")
        {
            string empID = (this.DataList1.DataKeys[e.Item.ItemIndex]).ToString();
            string LName = ((TextBox)e.Item.FindControl("txtEditLN")).Text;
            string FName = ((TextBox)e.Item.FindControl("txtEditFN")).Text;
            string Birth = ((TextBox)e.Item.FindControl("txtEditBD")).Text;
            string Add = ((TextBox)e.Item.FindControl("txtEditAD")).Text;
            string city = ((TextBox)e.Item.FindControl("txtEditCY")).Text;
            SqlConnection conn = DB.CreateCon();
            conn.Open();
            SqlCommand cmd = new SqlCommand();
            cmd.CommandText = "update Employees set LastName='" + LName + "',FirstName='" + FName + "',BirthDate='" + Birth + "',Address='" + Add + "',City='" + city + "' where EmployeeID='"+empID+"'" ;
            cmd.Connection = conn;
            cmd.ExecuteNonQuery();
            this.DataList1.EditItemIndex = -1;
            this.BinderToDataList();
        }
    }
    protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
    {
        if ((e.Item.ItemType == ListItemType.Item) || (e.Item.ItemType == ListItemType.AlternatingItem))
        {
            e.Item.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor=#'cccccc'");
            e.Item.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
        }
    }
}datalist.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="dataList.aspx.cs" Inherits="dataList" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:DataList ID="DataList1" runat="server" CellPadding="4" ForeColor="#333333" Height="242px" Width="430px" OnItemCommand="DataList1_ItemCommand" OnEditCommand="DataList1_EditCommand" OnCancelCommand="DataList1_CancelCommand" OnUpdateCommand="DataList1_UpdateCommand" OnItemDataBound="DataList1_ItemDataBound">
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <SelectedItemStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <AlternatingItemStyle BackColor="White" ForeColor="#284775" />
            <ItemStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
        <HeaderTemplate>
            <div align=center>模板页眉</div>
        </HeaderTemplate>
        <ItemTemplate>
            <%# DataBinder.Eval(Container.DataItem,"EmployeeID") %>
            &nbsp;&nbsp;&nbsp;
            <%# DataBinder.Eval(Container.DataItem,"LastName") %>
            &nbsp; &nbsp;&nbsp; 
            <%# DataBinder.Eval(Container.DataItem,"FirstName") %>
            &nbsp; &nbsp;&nbsp;
            <asp:LinkButton ID="Hselect" runat="server" CommandName="select">查看详细内容</asp:LinkButton>
            <asp:LinkButton ID="Hedit" runat="server" CommandName="edit">编辑</asp:LinkButton>
        </ItemTemplate>
        <AlternatingItemTemplate>
            <%# DataBinder.Eval(Container.DataItem,"EmployeeID") %>
            &nbsp;&nbsp;&nbsp;
            <%# DataBinder.Eval(Container.DataItem,"LastName") %>
            &nbsp;&nbsp;&nbsp;
            <%# DataBinder.Eval(Container.DataItem,"FirstName") %>
            &nbsp;&nbsp;&nbsp;
            <asp:LinkButton ID="Hselect" runat="server" CommandName="select">查看详细内容</asp:LinkButton>
            <asp:LinkButton ID="Hedit" runat="server" CommandName="edit">编辑</asp:LinkButton>
        </AlternatingItemTemplate>
        <SelectedItemTemplate>
            <div>编号：<%# DataBinder.Eval(Container.DataItem,"EmployeeID") %></div>
            <div>姓氏：<%# DataBinder.Eval(Container.DataItem,"LastName") %></div>
            <div>名字：<%# DataBinder.Eval(Container.DataItem,"FirstName") %></div>
            <div>生日：<%# DataBinder.Eval(Container.DataItem,"BirthDate","{0:D}") %></div>
            <div>住址：<%# DataBinder.Eval(Container.DataItem,"Address") %></div>
            <div>城市：<%# DataBinder.Eval(Container.DataItem,"City") %>&nbsp;&nbsp;<asp:LinkButton ID="Hback" runat="server" CommandName="back">返回</asp:LinkButton></div>
        </SelectedItemTemplate>
        <FooterTemplate>
            <div align=center>模板页脚</div>
        </FooterTemplate>
            <EditItemTemplate>
                <asp:LinkButton ID="Hupdate" runat="server" CommandName="update">保存</asp:LinkButton>
                <asp:LinkButton ID="Hcancel" runat="server" CommandName="cancel">取消</asp:LinkButton>
                <div><asp:TextBox ID="txtEditID" runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"EmployeeID") %>' Enabled=false></asp:TextBox></div>
                <div><asp:TextBox ID="txtEditLN" runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"LastName") %>'></asp:TextBox></div>
                <div><asp:TextBox ID="txtEditFN" runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"FirstName") %>'></asp:TextBox></div>
                <div><asp:TextBox ID="txtEditBD" runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"BirthDate") %>'></asp:TextBox></div>
                <div><asp:TextBox ID="txtEditAD" runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"Address") %>'></asp:TextBox></div>
                <div><asp:TextBox ID="txtEditCY" runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"City") %>'></asp:TextBox></div>
            </EditItemTemplate>
        </asp:DataList>
    </form>
</body>
</html>