protected void ddlState1_SelectedIndexChanged(object sender, EventArgs e) { try { city.StateId = int.Parse(ddlState1.SelectedValue); ddlCity1.DataSource = city.GetCityByState(); ddlCity1.DataTextField = "CityName"; ddlCity1.DataValueField = "CityId"; ddlCity1.DataBind(); ddlCity1.Items.Insert(0, "---Select---"); } catch (Exception) { lblMsg.Text = "Plz Select State"; } }