problem with Process bar

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ASP.NET

Hello,
I have two textboxes and two calenderextender controls and one submit buttons in tabpanel.
Whenever I select two dates and press submit button it will generate a bar cart in the tabpanel. So I am using a processbar before generating barchart. Now I want to hide the page whenever I click the submit button and show the processbar before generating the bar charts. How can I hide the table or table data. I am using some code but it is not working properly. The processbar is showing here and there and the table is not hiding.

<td id="Td1" runat="server" align="center" valign="middle" >
<asp:Panel ID="PanelProcessBar" runat="server" >
  <asp:UpdateProgress ID="UpdateProgress2" runat="server" AssociatedUpdatePanelID="UpdatePanel1" DisplayAfter="2000" DynamicLayout ="true">
    <ProgressTemplate>
      <asp:Image ID="ImgProcessBar" runat="server" ImageUrl="~/images/ajax-loader.gif" />
    </ProgressTemplate>
  </asp:UpdateProgress>
</asp:Panel>

protected void BtnShow_Click(object sender, EventArgs e)
{
  System.Threading.Thread.Sleep(2000);
  if (IsPostBack)
  {
    TdTabContainer.Visible = false;
  }
  Get_BarChart();
}

If anybody knows a solution, please help me.
Thank you!