private int state = 0;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["State"] != null)
        {
            state = Convert.ToInt32(Session["State"].ToString());
        }
        else
        {
            Session["State"] = 0;
        }
        if (state > 0 && state <= 10)
        {
            this.lblMessages.Text = "Task undertaking!";
            this.panelProgress.Width = state * 30;
            this.lblPercent.Text = state * 10 + "%";
            Page.RegisterStartupScript("", "");
        }
        if (state == 100)
        {
            this.panelProgress.Visible = false;
            this.panelBarSide.Visible = false;
            this.lblMessages.Text = "Task Completed!";
            Page.RegisterStartupScript("", "");
        }

    }

////////////design view for progressbar///////////////
<form id="Form1" method="post" runat="server">
<asp:Label id="lblMessages" runat="server"></asp:Label>
<asp:Panel id="panelBarSide" runat="server" Width="300px" BorderStyle="Solid" BorderWidth="1px"
ForeColor="Silver">
<asp:Panel id="panelProgress" runat="server" Width="10px" BackColor="Green"></asp:Panel>
</asp:Panel>
<asp:Label id="lblPercent" runat="server" ForeColor="Blue"></asp:Label>
</form>//////////////