Choose Country corresponding state list appears

Satyapriyanayak
Posted by Satyapriyanayak under ASP.NET category on | Points: 40 | Views : 1288
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();
}
}

Comments or Responses

Posted by: Learningtorise on: 5/9/2013 Level:Starter | Status: [Member] | Points: 10
Spoiler: There Should be an If Condition to check whether selected text is not "Choose country" in DropDownList_country_SelectedIndexChanged function, else it will give exception .

;)
Posted by: Learningtorise on: 5/9/2013 Level:Starter | Status: [Member] | Points: 10
Spoiler: There Should be an If Condition to check whether selected text is not "Choose country" in DropDownList_country_SelectedIndexChanged function, else it will give exception .

;)

Login to post response