in ajax tab container in gridview shows the record in asp.net

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C#3.5

My source page code as follows

<ajaxToolkit:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0">
        <ajaxToolkit:TabPanel ID ="tbfaculty" runat ="server">

        <HeaderTemplate>
          Faculty
        </HeaderTemplate>


            <ContentTemplate>
           <asp:Panel id="pnlfac" runat="server" backcolor="White" bordercolor ="Black" borderstyle="Solid" borderwidth="1px" height="144px">
           <asp:GridView id="gvfaculty" runat="server" backcolor="LightGoldenrodYellow" BorderColor="Tan" width="91px" autogeneratecolumns = "False" ForeColor="Black">
           <FooterStyle BackColor="Tan" />
                    <HeaderStyle BackColor="Tan" Font-Bold="True" />
                    <PagerStyle BackColor="PaleGoldenrod" ForeColor="DarkSlateBlue" HorizontalAlign="Center" />
                    <SelectedRowStyle BackColor="DarkSlateBlue" ForeColor="GhostWhite" />
                    <Columns>
                     <asp:BoundField DataField="Faculty Name" HeaderText="Faculty Name" />


              <asp:TemplateField HeaderText="Does the Faculty come well prepared for his subject">
                 <ItemTemplate>
                <asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="true">
                <asp:ListItem Value="-1">--Select Rating --</asp:ListItem>
                </asp:DropDownList>
               </ItemTemplate>
        </asp:TemplateField>


         <asp:TemplateField HeaderText="Is he loud and clear in his speech">
                 <ItemTemplate>
                <asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="true">
                <asp:ListItem Value="-1">--Select Rating --</asp:ListItem>
                </asp:DropDownList>
               </ItemTemplate>
        </asp:TemplateField>

in run mode in tab container as follows

Faculty
When i click the faculty in tab container i want to show the gridview.


for display the gridview content in tab container i written a code as follows

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
try
{
Facultybindgrid();
}
catch
{

}
}
}

private void Facultybindgrid()
{
DataTable dt = new DataTable();
dt.Rows.Add("CPG");
dt.Rows.Add("BSR");
gvfaculty.DataSource = dt;
gvfaculty.DataBind();
gvfaculty.Visible = true;
}

but when i run and click the faculty in tab container the gridview is not displaying.

please help me.from my above code what is the mistake i made.

regards
Jegan B