DropDownList AutoPostBack, Item, Index and Value in asp.net c#

February 08, 2014 0 Comments


First of all, I would like to thank all of the readers who have read my previous articles. What a great support i have got from you people.I really felt great when use of DropDownlist article was displayed on the dotprogramming page. Following are the articles that I have written so far for beginners.

In this article, we will get DropdownList item text , index value and value of it. Generally, we know that it is bind with ListItem class properties. 

Lets take an simple example 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Dropdownlist.aspx.cs" Inherits="Dropdownlist" %>

<!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">
    <form id="form1" runat="server">
        <strong>Get DropDownList Control&nbsp; Item, Index and value </strong>
        <br />
        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
        Height="42px" onselectedindexchanged="DropDownList1_SelectedIndexChanged" 
            <asp:ListItem>Select Country</asp:ListItem>
            <asp:ListItem Value="Top Country">USA</asp:ListItem>
            <asp:ListItem Value="United State">UK</asp:ListItem>
            <asp:ListItem Value="awsome ">Itly</asp:ListItem>
    <br />
    <br />
    <asp:Label ID="Label1" runat="server"></asp:Label>

// Code behind code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Dropdownlist : System.Web.UI.Page
    protected void Page_Load(object sender, EventArgs e)

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        Label1.Text = "You selected: <br /> Dropdownlist Text: " +
            DropDownList1.SelectedItem.Text.ToString() +
            "<br />Dropdown Value: " + DropDownList1.SelectedValue.ToString() +
            "<br />Dropdown Index: " + DropDownList1.SelectedIndex.ToString(); 

Code generate the following output

DropDownList AutoPostBack, Item, Index and Value in asp.net c#

Jacob Lefore

Some say he’s half man half fish, others say he’s more of a seventy/thirty split. Either way he’s a fishy bastard. Google