Layout Template Is Not Working In Listview When I Use Grouptemplate. How To Solve This One

hi, why Layout template is not working in listview when i use grouptemplate.

everything works except layouttemplate.

here, i put the coding.

aspx page:

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:ListView ID="ListView1" runat="server" GroupItemCount="3">
<LayoutTemplate>
<table cellpadding="2" width="640px" border="2" runat="server" id="Table1">
<tr id="groupPlaceholder">
</tr></table>
</LayoutTemplate>
<GroupTemplate>
<table><tr id="tableRow" runat="server">
<td id="itemPlaceholder" runat="server">
</td></tr></table>
</GroupTemplate>
<ItemTemplate>
<td runat="server">
Item Template
<br />
ID:
<%#Eval("Employee ID") %><br />
Name:
<%#Eval("Last Name") %>
</td>
</ItemTemplate>
<ItemSeparatorTemplate>
<td id="Td1" style="width:20px;" runat="server">

</td>
</ItemSeparatorTemplate>

</asp:ListView>
</asp:Content>

aspx.cs (code behind).

namespace test123
{
public partial class _Default : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)
{


DataTable dt = new DataTable();
dt.Columns.Add("Employee ID", typeof(int));
dt.Columns.Add("Last Name", typeof(string));
for (int i = 0; i <= 2; i++)
{
string desc = string.Empty;
switch (i)
{
case 0:
{
desc = "Raj";
break;
}
case 1:
{
desc = "amri";
break;
}
case 2:
{
desc = "Kumar";
break;
}
}
dt.Rows.Add(i, desc);
}
ListView1.DataSource = dt;
ListView1.DataBind();
}

}
}

the output come like below:

Item Template   Item Template   ItemTemplate

ID: 0                 ID:1                  ID:2

Name:Raj           Name:amri         Name:Kumar

see, here Layout is not doing anything. No border, no cellpadding. how to solve this? why it is not coming? help needed.