Introduction
AddRange ( ) method
Adds the items in an array of System.Web.UI..WebControls.ListItem objects to the collection or we can say add items to the array using list of item. Here we take a simple example for binding dropdownlist using list of item.
Step-1: Drop one DropDownlist to the design window.Step-2: Take a array of ListItem also overload with ListItem class.
Step-3: Add item to the ListItem class constructor.
Step-4: Bind DropDownList using AddRange method.
Example of AddRange Method
Source Code
<%@ PageLanguage="C#"AutoEventWireup="true"CodeFile="Default2.aspx.cs"Inherits="Default2"%>
<!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"AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>
<br />
<br />
<asp:Label ID="Label1" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
Codebehind Code
Codebehind 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 Default2 : System.Web.UI.Page
{
protected voidPage_Load(object sender, EventArgs e)
{
ListItem[] arr = newListItem[]
{ new ListItem("apple", "20"),
new ListItem("mango", "15"),
new ListItem("orange", "30") };
DropDownList1.Items.AddRange(arr);
}
protected voidDropDownList1_SelectedIndexChanged(objectsender, EventArgs e)
{
Label1.Text = "Your selected item detail are <br/>Item Text : " + DropDownList1.SelectedItem.Text + "<br/>Item value " + DropDownList1.SelectedValue;
}
}
Output
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