Example to add list items when the page is loaded
WebForm1.aspx :-
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="_16_dropdownlist.WebForm1" %>
<!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>
<asp:DropDownList ID="DropDownList1" runat="server">
<asp:ListItem Selected="True" Value="1">Male</asp:ListItem>
<asp:ListItem Value="2">Female</asp:ListItem>
</asp:DropDownList>
<br />
<br />
<asp:DropDownList ID="DropDownList2" runat="server">
</asp:DropDownList>
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
WebForm1.aspx.cs :-
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace _16_dropdownlist
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ListItem city1 = new ListItem("London", "1");
ListItem city2 = new ListItem("Canada", "2");
ListItem city3 = new ListItem("Japan", "3");
DropDownList2.Items.Add(city1);
DropDownList2.Items.Add(city2);
DropDownList2.Items.Add(city3);
}
}
}
}
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