I have two dropdowns when I select one dropdown value. I need to bind the other dropdown without postback. Help me with the code.

Question

I have two dropdowns when I select one dropdown value. I need to bind the other dropdown without postback. Help me with the code. Regards MZee.

Satyapriya Nayak · Answer

Hi Virus Try this... Untitled Page ForeColor=Red Width=100px> AppendDataBoundItems=true runat=server Height=20px Width=156px onselectedindexchanged=ddlcountry_SelectedIndexChanged Font-Bold=True ForeColor=#FF9900> ForeColor=Red Width=100px> AppendDataBoundItems =true runat=server Height=20px Width=155px onselectedindexchanged=ddlstate_SelectedIndexChanged Font-Bold=True ForeColor=#993300> ForeColor=Red Width=100px> runat=server Height=20px Width=155px Font-Bold=True ForeColor=#CCCC00> using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Data.SqlClient; namespace Country_state_city { public partial class _Default : System.Web.UI.Page { string strConnString = ConfigurationManager.ConnectionStrings[ConnectionString].ConnectionString; string str; SqlCommand com; SqlDataAdapter sqlda; DataSet ds; protected void Page_Load(object sender EventArgs e) { if (!IsPostBack) { bindcountry(); } } protected void ddlcountry_SelectedIndexChanged(object sender EventArgs e) { bindstate(); } protected void ddlstate_SelectedIndexChanged(object sender EventArgs e) { bindcity(); } public void bindcountry() { SqlConnection con = new SqlConnection(strConnString); con.Open(); str = select CountryIdCountryName from Country; com = new SqlCommand(str con); sqlda = new SqlDataAdapter(com); ds = new DataSet(); sqlda.Fill(ds Country); ddlcountry.Items.Clear(); ddlcountry.Items.Add(--Select--); ddlcountry.DataValueField = CountryId; ddlcountry.DataTextField = CountryName; ddlcountry.DataSource = ds; ddlcountry.DataMember = Country; ddlcountry.DataBind(); con.Close(); } public void bindstate() { SqlConnection con = new SqlConnection(strConnString); con.Open(); str = select StateIdStateName from State where Country_Id=' + ddlcountry.SelectedValue + '; com = new SqlCommand(str con); sqlda = new SqlDataAdapter(com); ds = new DataSet(); sqlda.Fill(ds State); ddlstate.Items.Clear(); ddlstate.Items.Add(--Select--); ddlstate.DataValueField = StateId; ddlstate.DataTextField = StateName; ddlstate.DataSource = ds; ddlstate.DataMember = State; ddlstate.DataBind(); con.Close(); } public void bindcity() { SqlConnection con = new SqlConnection(strConnString); con.Open(); str = select CityIdCityName from City where State_Id =' + ddlstate.SelectedValue + '; com = new SqlCommand(str con); sqlda = new SqlDataAdapter(com); ds = new DataSet(); sqlda.Fill(ds City); ddlcity.Items.Clear(); ddlcity.Items.Add(--Select--); ddlcity.DataValueField = CityId; ddlcity.DataTextField = CityName; ddlcity.DataSource = ds; ddlcity.DataMember = City; ddlcity.DataBind(); con.Close(); } } } Thanks If this post helps you mark it as answer

RanjithKumar chiguruvada · Answer

Hi Take two dropdown lists with following as AutoPostBack=true onselectedindexchanged=ddlFirst_SelectedIndexChanged > onselectedindexchanged=ddlSecond_SelectedIndexChanged AutoPostBack=true > and write the events in code behind file as protected void ddlFirst_SelectedIndexChanged(object sender EventArgs e) { var first = ddlFirst.SelectedValue.ToString(); ddlSecond.SelectedValue = first.ToString(); } protected void ddlSecond_SelectedIndexChanged(object sender EventArgs e) { var second = ddlSecond.SelectedValue.ToString(); ddlFirst.SelectedValue = second.ToString(); } That's it. if any queries please let me ask.

I have two dropdowns, when I select one dropdown value. I need to bind the other dropdown without postback. Help me with the code.