Update Progress in ASP.Net

.aspx code

 

  <div>

    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

        <ContentTemplate>

        <center>

        <div><asp:Button ID ="btnUpdate" runat="server" Text="Update"

                onclick=" btnUpdate_Click"/>

            <br />

        <asp:Label ID ="label1" runat ="server">asp:Label>

        div>

        center>

        ContentTemplate>

        asp:UpdatePanel>

        <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1" DisplayAfter="3000" DynamicLayout ="true">

        <ProgressTemplate>

        <center><img id="Img1" src="Images/progressbar.gif" height="50" width="50" runat="server" />center>

        ProgressTemplate>

        asp:UpdateProgress>

    div>

.aspx.cs code

  protected void btnUpdate_Click(object sender, EventArgs e)

    {

        System.Threading.Thread.Sleep(5000);

        label1.Text = "Page refreshed at" + DateTime.Today.ToLongDateString() + "" + DateTime.Now.ToLongTimeString();

    }