Asp.net TextBox OnTextChanged Event

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TextChanged Event of C# TextChanged Event:


In this Post we see an Example of asp.net Textbox TextChanged event. And we also describe why we use this event and when in Asp.net web application.

TextChanged is an event:

  protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
       
    }
   
Here we see that the TextChanged accept two Arguments. User or sender object and Event Argument.

  • Textbox onTextChanged occurs when the text is modified or changed in a TextBox.
  • We take a program dependent on the value of a TextBox when the user types.

TextChanged as a Triggered:

  • TextChanged is triggered, when you typed something into an Asp.net TextBox. And then the resulting value changes.
  • The TextChanged is also activated when the program itself changes the Asp TextBox Text by code, and value is different.

Use of TextChanged in asp.net:

TextChanged when you want use synchronize parts of the UI together with a Text value in your application.

Asp.net - C# - TextBox onTextChanged event:

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

<!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>textChange Example.</title>
    <style type="text/css">
        .style1
        {
            color: #990000;
            text-decoration: underline;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div align="center">
        <h2 class="style1">
            TextBox OnTextChanged Example in Asp.net: </h2>
        <table style="width: 362px; height: 116px" border="2" frame="box">
            <tr>
                <td>
                <asp:Label ID="Label1" runat="server" Text="Email"> 
        </asp:Label>
                </td>
                <td>
               
        <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="true"
                        OnTextChanged="TextBox1_TextChanged" Width="209px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td>
               <asp:Label ID="Label2" runat="server" Text="Confirm Email"> 
        </asp:Label>
                </td>
                <td>
               
        <asp:TextBox ID="TextBox2" runat="server" BackColor="LightGoldenrodYellow"
                        ForeColor="Crimson" Width="206px"></asp:TextBox>
                </td>
            </tr>
        </table>    
       
    </div>
    </form>
</body>
</html> 


C#- code Textbox Text Change:

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

public partial class TextChangeEvent : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void TextBox1_TextChanged(object sender, EventArgs e)
    {
        TextBox2.Text = TextBox1.Text;
    }
   
}
Asp.net TextBox OnTextChanged Event
OnTextChanged Event


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