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Tuesday, January 5, 2016
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Bind or Insert Data into DropDownlist using List and ArrayList in ASP.NET C#

6:35 PMTuesday, January 5, 2016
In this article, I will show ou how to bind or insert items into Dropdownlist Using ArrayList or List in code behind file. ArrayList is a Collection of String items so it can contain string items Bydefault But in List<type> we have to specify type of items. In this article, I will take list as class type. I will give you an example of both. I am giving  you a youtube video:


1. Add two DropDownlist in the web form.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default11.aspx.cs" Inherits="Default11" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:DropDownList ID="DropDownList1" runat="server" Height="39px" Width="212px">
        </asp:DropDownList>  <br/>

<asp:DropDownList ID="DropDownList2" runat="server" Height="39px" Width="212px">
        </asp:DropDownList>


    </div>
    </form>
</body>
</html>

2. In the code behind file, I will provide you both ArrayList and List<type>. 

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

public partial class Default11 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            List<fruits> fitems = new List<fruits>();
            fitems.Add(new fruits(){FruitID=1,FruitName="Apple"});
            fitems.Add(new fruits() { FruitID = 2, FruitName = "Mango" });

DropDownList2.DataSource = fitems;
            DropDownList2.DataTextField = "FruitName";
            DropDownList2.DataValueField = "FruitID";
            DropDownList2.DataBind();
         

ArrayList listitem = new ArrayList();
           listitem.Add("Apple");
            listitem.Add("mango");
            listitem.Add("Grapes");

         

            foreach (object item in fitems)
            {
                DropDownList1.Items.Add(new ListItem(item.ToString(), item.ToString()));
            }



        }
    }
}

fruits.cs file

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

/// <summary>
/// Summary description for fruits
/// </summary>
public class fruits
{
    public int FruitID { get; set; }
    public string FruitName { get; set; }
public fruits()
{
//
// TODO: Add constructor logic here
//
}
}
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