How to write event on dynamically generated dropdownlist to fill other dropdownlist

Question

Hi I have generated 2 dropdown list dynamically.Now i want to fire event on 1st DDL so that depend on Id 2nd DDL data gets fill up (like depend on main category sub category will fill) Please help for this.I am attaching sourse code i have written for DDL Thanks Archana

Mayur Gujrathi · Answer

Archana your problem is to generate event or what to write in event Create evnt like this Button button = new Button(); button.Text = i.ToString(); button.Click += new EventHandler(Button_Click); and do what you want as suggested by datta or nayak as per your need

Satyapriya Nayak · Answer

Hi Archana Try this... Normal 0 Default.aspx code @ Page Language =C# AutoEventWireup =true CodeFile =Default.aspx.cs Inherits =_Default %> DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd> html xmlns =http://www.w3.org/1999/xhtml> head runat =server> title > Untitled Page title > head > body > form id =form1 runat =server> div > br /> asp : Label ID =Label3 runat =server Text =Country Width =100px> asp : Label > asp : DropDownList ID =DropDownList_country runat =server AutoPostBack =True onselectedindexchanged =DropDownList_country_SelectedIndexChanged> asp : DropDownList > br /> asp : Label ID =Label2 runat =server Text =State Width =100px> asp : Label > asp : DropDownList ID =DropDownList_state runat =server> asp : DropDownList > div > form > body > html > Default.aspx.cs code using System; 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; public partial class _Default : System.Web.UI. Page { string strConnString = ConfigurationManager .ConnectionStrings[ ConnectionString ].ConnectionString; string str; SqlCommand com; protected void Page_Load( object sender EventArgs e) { SqlConnection con = new SqlConnection (strConnString); if (!IsPostBack) { DropDownList_country.Items.Add( Choose country ); con.Open(); str = select country from area group by country ; com = new SqlCommand (str con); SqlDataReader reader = com.ExecuteReader(); while (reader.Read()) { DropDownList_country.Items.Add(reader[ country ].ToString()); } reader.Close(); con.Close(); } DropDownList_state.Items.Clear(); } protected void DropDownList_country_SelectedIndexChanged( object sender EventArgs e) { SqlConnection con = new SqlConnection (strConnString); con.Open(); str = select * from area where country=' + DropDownList_country.SelectedItem.Text + ' ; com = new SqlCommand (str con); SqlDataReader reader = com.ExecuteReader(); while (reader.Read()) { DropDownList_state.Items.Add(reader[ state ].ToString()); } reader.Close(); con.Close(); } } Thanks

Datta Kharad · Answer

Hi onselectedindexchanged=DropDownList1_SelectedIndexChanged Width=139px> Note:- AutoPostBack=True protected void DropDownList1_SelectedIndexChanged(object sender EventArgs e) { con=new SqlConnection(Your Connection string); con.Open(); string sSQL = Select SubCat from tabname where id=' + DropDownList1.SelectedValue + '; da = new SqlDataAdapter(sSQL con); DataSet ds=new DataSet(); da.Fill(ds Tabname); foreach (DataRow dr in ds.Tables[Tabname].Rows) { DropDownList2.Items.Add(dr[0].ToString()); } }