Gridview is loading multiple times - asp.net

Question

I have a gridview which is working fine (i.e. it is loading 4 rows) with bound controls. this grid view has 4 rows:
Ex: <asp:BoundField HeaderText="Classification" DataField="ClassType" />
but when I changed the gridview with itemtemplate then my gridview is loading 4 times
Structure:-
Gridview
- template field
-- Item template
<%# Eval("ClassType")%>
on code behind I am loading this via: (on page_load)
gvResultSet.DataSource = ds.Tables[0];
gvResultSet.DataBind();
Code
<asp:GridView ID="gvResultSet" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<table class="tb">
<thead>
<tr>
<th>
Classification
</th>
</tr>
</thead>
<tbody>
<tr class="record">
<td>
<%# Eval("ClassType")%>
</td>
</tr>
</tbody>
</table>
</ItemTemplate>
</asp:TemplateField>

Answer 1

Set gridview's property AutoGenerateColumns="false". This will solve your issue.
Update
My Recommendation is to use Repeater Control.
<asp:Repeater ID="Repeater1" runat="server">
<HeaderTemplate>
<table class="tb">
<thead>
<tr>
<th>
Status
</th>
<th>
Name
</th>
<th>
Start Time
</th>
<th class="date">
End Time
</th>
<th>
MAX Date found
</th>
<th>
Classification
</th>
<th class="last">
Read Description
</th>
</tr>
</thead>
<tbody>
</HeaderTemplate>
<ItemTemplate>
<tr class="record">
<td>
<div class="toggle enabled">
</div>
</td>
<td class="overflow">
<%# Eval("Name")%>
</td>
<td class="overflow">
12/23/2014 6:20:47
</td>
<td>
12/23/2014 6:27:21
</td>
<td class="date">
12/23/2014
</td>
<td>
<%# Eval("ClassType")%>
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</tbody> </table>
</FooterTemplate>
</asp:Repeater>

Answer 2

It would be much simpler this way
<asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="false" CssClass="tb">
<Columns>
<asp:TemplateField HeaderText="Classification">
<ItemTemplate><%# Eval("ClassType")%></ItemTemplate>
</asp:TemplateField>
</Columns>
<RowStyle CssClass="record" />
</asp:GridView>
If you want header inside th, do this after DataBind
gvResultSet.DataBind();
gvResultSet.HeaderRow.TableSection = TableRowSection.TableHeader;