ASP.NET application works on AutoPostBack model, i mean, if we want to run code behind event like TextChanged event then we must set AutoPostBack property is true.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>
<!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>
Search Item<asp:TextBox ID="TextBox1" runat="server"
AutoPostBack="True" Width="174px" ontextchanged="TextBox1_TextChanged"></asp:TextBox>
<br />
<br />
</div>
<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 Default3 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
string[] arr = { "jacob", "lefore", "martin" };
foreach (string item in arr)
{
if (item==TextBox1 .Text)
{
Label1.Text = item;
}
}
}
}
Output
This example shows that TextChanged event occurs when user focus out from the TextBox. You can search item on TextChanged event.