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Editorial Team
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Asked: 2026-05-20T02:35:18+00:00

I have a simple aspx file <%@ Page Language=VB AutoEventWireup=false CodeFile=test4.aspx.vb Inherits=test4 %> <!DOCTYPE

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I have a simple aspx file

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="test4.aspx.vb" Inherits="test4" %>

<!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">

<body>
<form id="form1" runat="server">
    <div id="content">
   <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
       <br />
       <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
    </div>
</form>
</body>
</html>

And this is the test4.aspx.vb code file

Partial Class test4
Inherits System.Web.UI.Page

Protected Sub TextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
    TextBox2.Text = TextBox1.Text
End Sub
End Class

Now the problem is that even if i type something in the textBox1 the textchanged event if not firing why??. What should i do??

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1 Answer

  1. Editorial Team

    You need to enable AutoPostBack on the TextBox that results in the event.

    The problem with your code is it’s a server-side event trying to invoke a client-side event. The text needs to be entered in TextBox1 and then it will result in the AutoPostBack.

    <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True"></asp:TextBox>

    Based on your need though. It may be better to populate the TextBox2 with the value from TextBox1 using JavaScript.

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