protected void ddlState_SelectedIndexChanged(object sender, EventArgs e) { ddlArea.Items.Clear(); BloodBL bl = new BloodBL(); List <string> areas = bl.GetAreaFromHospitalByState(int.Parse(lblUserId.Text), ddlState.SelectedItem.Text); ddlArea.DataSource = areas; ddlArea.DataBind(); ddlArea.Items.Insert(0, "Select Area"); }