protected void btnCreate_Click(object sender, EventArgs e)
        {
            try
            {
                NetworkCredential NetCredentials = new NetworkCredential();
                NetCredentials.UserName = SessionManager.GetNAVUserName(HttpContext.Current);
                NetCredentials.Password = SessionManager.GetNAVUserPassword(HttpContext.Current);

                Web_Order_Mail objser = new Web_Order_Mail();
                objser.UseDefaultCredentials = true;
                objser.Credentials           = NetCredentials;
                no = objser.CreateReleasedProductionOrder(drpItem.SelectedItem.Value, Convert.ToString(Session["NavUserName"]));

                objser                  = null;
                lblItemNo.Text          = drpItem.SelectedItem.Value;
                lblItemDescription.Text = drpItem.SelectedItem.Text;
                lblItemNo.Visible       = false;
                lblNo.Text              = no;
                pnlHide.Visible         = false;
                pnlShow.Visible         = true;
                tblID.Visible           = true;
                txtPostingDate.Focus();
            }
            catch (Exception ex)
            {
                var message1 = new JavaScriptSerializer().Serialize(ex.Message.ToString());
                var script1  = string.Format("alert({0});", message1);
                ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "", script1, true);
            }
        }