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(); } }