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Saturday, February 8, 2014
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DropDownList AutoPostBack, Item, Index and Value in asp.net c#

10:52 PMSaturday, February 8, 2014

Introduction

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">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <strong>Get DropDownList Control&nbsp; Item, Index and value </strong>
        <br />
    </div>
        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
        Height="42px" onselectedindexchanged="DropDownList1_SelectedIndexChanged" 
        Width="138px">
            <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>
        </asp:DropDownList>
    <br />
    <br />
    <asp:Label ID="Label1" runat="server"></asp:Label>
    </form>
</body>
</html>

// 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#

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