protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                List <Division> divisionList = districtManager.GetAllDivisionByDropDownList();
                divisionNameDropDownList.DataSource     = divisionList;
                divisionNameDropDownList.DataValueField = "DivisionId";
                divisionNameDropDownList.DataTextField  = "DivisionName";
                divisionNameDropDownList.DataBind();

                List <District> districtList = districtManager.GetAllDistrict();
                Session["district"] = districtList;
                Session["active"]   = -1;

                districtCodeTextBox.Text = LoadNextDistrictCode();
            }
        }