.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
 
Sign In
Register
 
Win Surprise Gifts!!!
Congratulations!!!


Top 5 Contributors of the Month
david stephan

Home >> Code Snippets >> ASP.NET Controls >> Post New Resource Bookmark and Share   

 Subscribe to Code Snippets

Choose Country corresponding state list appears

Posted By:satyapriyanayak       Posted Date: May 02, 2013    Points: 40    Category: ASP.NET Controls    URL: http://www.dotnetspark.com  

Here we will know, when we choose a Country from a dropdownlist its corresponding state list appears in another dropdownlist. For that we drag and drop two dropdownlist from the toolbox and place those controls into the webpage.
 

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();
    }
}


     

Further Readings:

Responses

No response found. Be the first to respond this post

Post Comment

You must Sign In To post reply
Find More code samples in C#, ASP.Net, Vb.Net and more Here

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend